title: Unity3D : Blur the background of a UI canvas
body: <p>I'm trying to create a blur effect on the background of a UI window for my game in Unity3D.</p>
  <p>One of the best examples I can think of right now is Heroes Of The Storm, notice how the background of the Level Up panel blurs what's behind it :</p>
  <p><img src="https://i.stack.imgur.com/VpEvj.jpg" alt="Heroes Of The Storm Blur Effect" /></p>
  <p>Is there any way to reproduce the same effect with the recently-added Canvas in Unity3D?
  I know there is a way to do so by using a camera, but I'm not really familiar with the whole thing, especially when it comes to making it work with the new UI system.</p>
  <p>Thanks.</p>