title: video.js auto quality switcher depends on bandwidth, like youtube.com
body: <p>I'm using videojs  in my page.
  I have 3 version of my video (1080p,720p,480p) with .mp4 format.
  I'm searching for best way (must popular, simple, clean) that player select file depends on bandwidth on auto mode, and show a menu to select quality manually.</p>
  
  <p>I searched in google. but no sample i found.</p>