title: Custom showsCameraControls for UIImagePickerControllerSourceTypeCamera
body: <p>I want to add two extra buttons to my UIImagePickerController. I saw that done in an app: 
  <a href="http://itunes.apple.com/us/app/camwow-free-photo-booth-effects/id418368641?mt=8" rel="nofollow">camwow</a> but I couldn't find the documentation to do that. I have a view overlay over the UIImagePickerControllerSourceTypeCamera but at the moment touches on the buttons from the view overlay propagate to the camera controller which focuses.</p>