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iOS present camera overlay view
//create an overlay view instance
OverlayView *overlay = [[OverlayView alloc]
initWithFrame:CGRectMake(0, 0, SCREEN_WIDTH, SCREEN_HEIGTH)];
//create a new image picker instance
UIImagePickerController *picker =
[[UIImagePickerController alloc] init];
//set source to video!
picker.sourceType = UIImagePickerControllerSourceTypeCamera;
//hide all controls
picker.showsCameraControls = NO;
picker.navigationBarHidden = YES;
picker.toolbarHidden = YES;
//make the video preview full size
picker.wantsFullScreenLayout = YES;
picker.cameraViewTransform =
CGAffineTransformScale(picker.cameraViewTransform,
CAMERA_TRANSFORM_X,
CAMERA_TRANSFORM_Y);
//set our custom overlay view
picker.cameraOverlayView = overlay;
//show picker
[self presentModalViewController:picker animated:YES];
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