title: MPMoviePlayerController and play audio from other apps, such as spotify, in background
body: <p>I use the MPMoviePlayerController and I would like the user to be able to watch a video that contains audio, and be able to continue listening to their Spotify or other music app already running in the background. How can I allow my app to play a movie and allow the user to continue listening to music?</p>
  
  <pre><code>        self.moviePlayer = MPMoviePlayerController(contentURL: url)
          if var player = self.moviePlayer {
              // let the preview loop
              self.stopPreview = false
              UIApplication.sharedApplication().statusBarHidden=true
              player.view.frame = self.view.bounds
              player.prepareToPlay()
              player.scalingMode = .AspectFill
              player.controlStyle = .None
              self.view.addSubview(player.view)
  
              // custom UI preview controlls
              // Back button and send buttons
              self.view.addSubview(self.confirmationView)
              self.view.bringSubviewToFront(self.confirmationView)
          }
  </code></pre>