CvCaptureFromCAM not working in xcode?

Do cvCaptureFromCAM

not get hooked on iPhone or iPad. It cannot open the camera of the device. I applied

CvCapture* capture =  cvCaptureFromCAM( CV_CAP_ANY );
CvCapture* capture =  cvCaptureFromCAM( 0 );
CvCapture* capture =  cvCaptureFromCAM( -1 );

      

        
        
        
      

    

but every time it returns null

. CvCaptureFromCAM download streaming in ios device?

Thanks in advance.