title: Play video from new URL without creating a new AVPlayer object
body: <p>I'm trying to allow users to be able to cycle through videos, changing the AVPlayer URL on the fly without refreshing the view. However, right now I'm just instantiating AVPlayer objects every time a video is played (resulting in audio to be played over one another), which I feel isn't the best way to do this. Is there a more efficient way similar to changing the image in an imageView?</p>
  
  <p>This is the code where I play the clip:</p>
  
  <pre><code>player = AVPlayer(URL: fileURL)
  playerLayer = AVPlayerLayer(player: player)
  playerLayer!.frame = self.view.bounds
  self.view.layer.addSublayer(playerLayer!)
  player!.play()
  </code></pre>