title: Play youtube video in Background using YouTube Helper Library iOS
body: <p>Im using YouTube Helper Library to play YouTube videos on my iOS application<br>
  <a href="https://developers.google.com/youtube/v3/guides/ios_youtube_helper" rel="nofollow">Here are link of Library</a>
  I just need a way to continue audio (or video) playing in background ,<br>
  So when user click on home button i need him to be able to hear the voice<br>
  of the video ,<br>
  even when he lock his device i need to him to be able to control the sound and 
  click next and back button for audio playing ..
  How i can achieve that on YouTube Helper Library ?</p>
  
  <p><strong>NOTE: many application do that and they exist on app-store like iMusic , Video Tube ,MusicTV , MB2</strong></p>