message: fix: AVFoundation inconsistent camera indices
diff: @@ -376,6 +376,15 @@ int CvCaptureCAM::startCaptureDevice(int cameraNum) {
  return 0;
  }
  + // Preserve devices ordering on the system
  + // see AVCaptureDevice::uniqueID property documentation for more info
  + devices = [devices
  + sortedArrayUsingComparator:^NSComparisonResult(AVCaptureDevice *d1,
  + AVCaptureDevice *d2) {
  + return [d1.uniqueID compare:d2.uniqueID];
  + }
  + ];
  +
  mCaptureDevice = devices[cameraNum];
  if ( ! mCaptureDevice ) {
  