iphone - Can capture session in avcam have multiple objects at a time -

here using avfoundation framework record video ,and i'm trying use both front , cam @ time here if front cam works cam freezing @ first frame , vise versa.can capturesession have multiple objects @ time.here code can 1 me please.

- (void)viewdidload  {  [super viewdidload]; self.view.frame = cgrectmake(0, 0, 320, 568); self.view.backgroundcolor = [uicolor clearcolor]; activeindicatorview = [[uiview alloc]initwithframe:cgrectmake(0, 0, 320, 250)]; activeindicatorview.backgroundcolor = [uicolor clearcolor]; [self.view addsubview:activeindicatorview]; activeindicatorviewback = [[uiview alloc]initwithframe:cgrectmake(0, 290, 320, 250)]; activeindicatorviewback.backgroundcolor = [uicolor greencolor]; [self.view addsubview:activeindicatorviewback]; tracksarray = [[nsmutablearray alloc]                initwithcapacity:2]; [self startrecording];  }   -(void)startrecording{  [self startcameratwo];//front camera [self startcamera];//back camera   } -(void)startcamera{  // nslog(@"setting capture session"); capturesessionback = [[avcapturesession alloc] init]; //add video input  avcapturedevice *videodeviceback = [avcapturedevice defaultdevicewithmediatype:avmediatypevideo];  // videodeviceback = [self frontcamera];  if (videodeviceback) {     nserror *error;     videoinputdeviceback = [avcapturedeviceinput deviceinputwithdevice:videodeviceback error:&error];     if (!error)     {         if ([capturesessionback canaddinput:videoinputdeviceback])             [capturesessionback addinput:videoinputdeviceback];         else             nslog(@"");     }     else     {         //nslog(@"couldn't create video input");     } } else { } avcapturedevice *audiocapturedeviceback = [avcapturedevice defaultdevicewithmediatype:avmediatypeaudio]; nserror *error = nil; avcapturedeviceinput *audioinputback = [avcapturedeviceinput deviceinputwithdevice:audiocapturedeviceback error:&error]; if (audioinputback) {     [capturesessionback addinput:audioinputback]; } previewback = [self videopreviewwithframeback :activeindicatorviewback.bounds]; previewback.backgroundcolor = [uicolor graycolor]; [activeindicatorviewback addsubview:previewback];   // [preview addsubview:vie]; moviefileoutputback = [[avcapturemoviefileoutput alloc] init]; moviefileoutputback.minfreediskspacelimit = 1024 * 1024;                        //<<set min free space in bytes recording continue on volume  if ([capturesessionback canaddoutput:moviefileoutputback])     [capturesessionback addoutput:moviefileoutputback];  //set connection properties (output properties) [self camerasetoutputpropertiesback];           //(we call method has done after changing camera)  //nslog(@"setting image quality"); [capturesessionback setsessionpreset:avcapturesessionpreset640x480]; if ([capturesessionback cansetsessionpreset:avcapturesessionpreset640x480]) {   //check size based configs supported before setting them     [capturesessionback setsessionpreset:avcapturesessionpreset640x480];   }  if ([videodeviceback isfocusmodesupported:avcapturefocusmodeautofocus] && [videodeviceback lockforconfiguration:&error]){     [videodeviceback setfocusmode:avcapturefocusmodeautofocus];     if ([videodeviceback isfocuspointofinterestsupported])         [videodeviceback setfocuspointofinterest:cgpointmake(0.5f,0.5f)];     [videodeviceback unlockforconfiguration]; }  [capturesessionback startrunning];  } -(void)startcameratwo{ // nslog(@"setting capture session"); capturesession = [[avcapturesession alloc] init]; //add video input  avcapturedevice *videodevice = [avcapturedevice defaultdevicewithmediatype:avmediatypevideo]; videodevice = [self frontcamera];  if (videodevice) {     nserror *error;     videoinputdevice = [avcapturedeviceinput deviceinputwithdevice:videodevice error:&error];     if (!error)     {         if ([capturesession canaddinput:videoinputdevice])             [capturesession addinput:videoinputdevice];         else             nslog(@"");     }     else     {         //nslog(@"couldn't create video input");     } } else {  }  avcapturedevice *audiocapturedevice = [avcapturedevice defaultdevicewithmediatype:avmediatypeaudio]; nserror *error = nil; avcapturedeviceinput *audioinput = [avcapturedeviceinput deviceinputwithdevice:audiocapturedevice error:&error]; if (audioinput) {     [capturesession addinput:audioinput]; }  preview = [self videopreviewwithframe:activeindicatorview.bounds]; activeindicatorview.backgroundcolor = [uicolor redcolor]; [activeindicatorview addsubview:preview]; moviefileoutput = [[avcapturemoviefileoutput alloc] init]; moviefileoutput.minfreediskspacelimit = 1024 * 1024;                        //<<set min free space in bytes recording continue on volume  if ([capturesession canaddoutput:moviefileoutput])     [capturesession addoutput:moviefileoutput];  //set connection properties (output properties) [self camerasetoutputproperties];           //(we call method has done after changing camera)  //nslog(@"setting image quality"); [capturesession setsessionpreset:avcapturesessionpreset640x480]; if ([capturesession cansetsessionpreset:avcapturesessionpreset640x480]) {   //check size based configs supported before setting them     [capturesession setsessionpreset:avcapturesessionpreset640x480];   }  if ([videodevice isfocusmodesupported:avcapturefocusmodeautofocus] && [videodevice lockforconfiguration:&error]){     [videodevice setfocusmode:avcapturefocusmodeautofocus];     if ([videodevice isfocuspointofinterestsupported])         [videodevice setfocuspointofinterest:cgpointmake(0.5f,0.5f)];     [videodevice unlockforconfiguration]; }  [capturesession startrunning]; }  - (void) camerasetoutputproperties { //set connection properties (output properties) captureconnection = [moviefileoutput connectionwithmediatype:avmediatypevideo];  //set landscape (if required) if ([captureconnection isvideoorientationsupported]) {     avcapturevideoorientation orientation = avcapturevideoorientationlandscapeleft;     //<<<<<set video orientation if landscape     [captureconnection setvideoorientation:orientation];  }  //set frame rate (if requried) cmtimeshow(captureconnection.videominframeduration); cmtimeshow(captureconnection.videomaxframeduration);  if (captureconnection.supportsvideominframeduration)     captureconnection.videominframeduration = cmtimemake(1, capture_frames_per_second); if (captureconnection.supportsvideomaxframeduration)     captureconnection.videomaxframeduration = cmtimemake(1, capture_frames_per_second);  cmtimeshow(captureconnection.videominframeduration); cmtimeshow(captureconnection.videomaxframeduration);  }    - (void) camerasetoutputpropertiesback   { //set connection properties (output properties) captureconnectionback = [moviefileoutputback connectionwithmediatype:avmediatypevideo];  //set landscape (if required) if ([captureconnectionback isvideoorientationsupported]) {     avcapturevideoorientation orientation = avcapturevideoorientationlandscapeleft;     //<<<<<set video orientation if landscape     [captureconnectionback setvideoorientation:orientation];  }  //set frame rate (if requried) cmtimeshow(captureconnectionback.videominframeduration); cmtimeshow(captureconnectionback.videomaxframeduration);  if (captureconnectionback.supportsvideominframeduration)     captureconnectionback.videominframeduration = cmtimemake(1, capture_frames_per_second); if (captureconnectionback.supportsvideomaxframeduration)     captureconnectionback.videomaxframeduration = cmtimemake(1, capture_frames_per_second);  cmtimeshow(captureconnectionback.videominframeduration); cmtimeshow(captureconnectionback.videomaxframeduration);  }  - (avcapturedevice *)frontcamera { nsarray *devices = [avcapturedevice deviceswithmediatype:avmediatypevideo]; (avcapturedevice *device in devices) {     if ([device position] == avcapturedevicepositionfront) {         return device;     } } return nil;   } 

currently it's not possible use front , facing cameras @ same time.