title: Subtract background in WebRTC
body: <p>I am looking for capture a person via WebRTC, is it possible to subtract the background and replace it with a custom background?.</p>
  
  <p>The idea is to capture movement as it says here: <a href="http://www.adobe.com/devnet/html5/articles/javascript-motion-detection.html" rel="nofollow">http://www.adobe.com/devnet/html5/articles/javascript-motion-detection.html</a> , the problem is that when there are very strong lights in the background, this also is processed altering the final product</p>