title: Getting error when trying to use AVPictureInPictureController in iOS 13 or tvOS 13
body: <p>I have small app which runs on iOS and tvOS where I’m displaying a video in UIView.It does support iOS 12 and tvOS 12.
  Now want to show PIP for tvOS hence trying to use AVPictureInPictureController gives error “Use of undeclared identifier 'AVPictureInPictureController”.</p>
  
  <p>Even though deployment target set to tvOS 13. In Xcode, capabilities -> Background mode -> enabled “ Audio,Airplay and Picture In Picture”.
  This basic code gives error.</p>
  
  <pre><code>#import &lt;AVKit/AVKit.h&gt;
  if ([AVPictureInPictureController isPictureInPictureSupported]) {
     // code 
  }
  </code></pre>
  
  <p>Any other settings missing or something else I need do ?</p>
  
  <p>Thanks</p>