Qt Code: 
  1. #include <stdio.h>
  2. #include "cv.h"
  3. #include "highgui.h"
  4.  
  5.  
  6. int main( int argc, char **argv )
  7. {
  8.  
  9.  
  10.  
  11.  
  12.     CvCapture *capture = 0;
  13.     CvCapture *capture1 =0;
  14.     IplImage  *frame = 0;
  15.     IplImage *frame1=0;
  16.     int       key = 0;
  17.     /* initialize camera */
  18.     capture = cvCaptureFromCAM( 0 );
  19.     capture = cvCaptureFromCAM( 1 );
  20.  
  21.     /* always check */
  22. //    if ( !capture ) {
  23. //        fprintf( stderr, "Cannot open initialize webcam!\n" );
  24. //        return 1;
  25. //    }
  26. //
  27. //    if ( !capture1 ) {
  28. //            fprintf( stderr, "Cannot open initialize webcam!\n" );
  29. //            return 1;
  30. //        }
  31.       cvSetCaptureProperty(capture, CV_CAP_PROP_FRAME_WIDTH, 640);
  32.        cvSetCaptureProperty(capture, CV_CAP_PROP_FRAME_HEIGHT, 480);
  33.  
  34.        cvSetCaptureProperty(capture1, CV_CAP_PROP_FRAME_WIDTH, 640);
  35.        cvSetCaptureProperty(capture1, CV_CAP_PROP_FRAME_HEIGHT, 480);
  36.  
  37.        cvSetCaptureProperty(capture, CV_CAP_PROP_FPS, 8);
  38.        cvSetCaptureProperty(capture1, CV_CAP_PROP_FPS, 8);
  39.     /* create a window for the video */
  40.     cvNamedWindow( "result", CV_WINDOW_AUTOSIZE );
  41.  
  42.     while( key != 'q' ) {
  43.         /* get a frame */
  44.         frame = cvQueryFrame( capture );
  45.         frame1 = cvQueryFrame( capture1 );
  46.         /* always check */
  47. //        if( !frame ) break;
  48. //        if( !frame1 ) break;
  49.  
  50.         /* display current frame */
  51.  
  52.  
  53.         cvShowImage("Left", frame);
  54.         cvShowImage("Right",frame1);
  55.  
  56.  
  57.  
  58.         /* exit if user press 'q' */
  59.         key = cvWaitKey( 1 );
  60.     }
  61.  
  62.     /* free memory */
  63.     cvDestroyWindow( "result" );
  64.     cvDestroyWindow( "result1" );
  65.     cvReleaseCapture( &capture );
  66.     cvReleaseCapture( &capture1 );
  67.  
  68.     return 0;
  69. }
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