title: UIMoviePlayerControllerDidEnterFullscreenNotification doesn't work in iOS8
body: <p>I am using <code>UIWebView</code> to play a youtube video with iFrame.<br>
  I am using <code>UIMoviePlayerControllerDidEnterFullscreenNotification</code> to detect youtube screen into fullscreen.<br>
  Like below code :   </p>
  
  <pre><code>[[NSNotificationCenter defaultCenter] addObserver: self
                                           selector: @selector(myMovieEnterFullScreen:)
                                               name: @"UIMoviePlayerControllerDidEnterFullscreenNotification"
                                             object: nil];
  </code></pre>
  
  <p>It works in iOS7.<br>
  But I try to run it in iOS8.<br>
  It doesn't work.<br>
  I think the notification name has be changed.<br>
  Has any alternative to detect the youtube fullscreen event in ios8?</p>