title: Black view at bottom when using custom camera overlay view (UIImagePickerController)
body: <p>I want to use custom camera overlay view. Below is the code for it.</p>
  
  <pre><code>imagePicker = [[UIImagePickerController alloc] init];
  self.imagePicker.delegate = self;
  self.imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;
  self.imagePicker.showsCameraControls = NO;
  self.imagePicker.cameraDevice = UIImagePickerControllerCameraDeviceFront;
  self.imagePicker.toolbarHidden = YES;
  self.imagePicker.wantsFullScreenLayout = YES;
  self.imagePicker.navigationBarHidden = YES;
  self.imagePicker.cameraOverlayView = [self cameraOverlayView];
  </code></pre>
  
  <p>The issue is there is a black background at bottom and I don't get from where it is coming.
  What is wrong in code?</p>