title: MPMoviePlayerController doesn't work after upgrading to iOS 5
body: <p>This code works perfectly on iPad 4.3 Simulator:</p>
  
  <pre><code>NSString *source = [mediaObject objectForKey:@"source"];
  NSString *videoPath = [NSString stringWithFormat:@"%@/%@", path, source];
  NSURL *videoUrl = [NSURL fileURLWithPath:videoPath];
  
  MPMoviePlayerController *videoPlayer = [[MPMoviePlayerController alloc] initWithContentURL:videoUrl];
  videoPlayer.shouldAutoplay = NO;
  
  videoPlayer.view.frame = CGRectMake(xPos, yPos, width, height);
  
  [backgroundImageView addSubview:videoPlayer.view];
  
  [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(videoPlaybackStateDidChange:) name:MPMoviePlayerPlaybackStateDidChangeNotification object:videoPlayer];
  </code></pre>
  
  <p>but it doesn't work on iPad 5 Simulator. I get a black frame with no movie nor playback controls.</p>
  
  <p>I read the Apple changelog about MPMoviePlayerController, but I didn't found anything about this problem. Can you help me?</p>