title: AVFoundation - Adding blur background to video
body: <p>I am working on a video editing app in <code>Swift</code>. In my case my output video looks like as following<a href="https://i.stack.imgur.com/dGHbQ.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/dGHbQ.png" alt="enter image description here" /></a><a href="https://i.stack.imgur.com/zxMKs.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/zxMKs.png" alt="enter image description here" /></a></p>
  <p>I am trying to fill the black portion with blur effect exactly like this<a href="https://i.stack.imgur.com/uC3ef.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/uC3ef.png" alt="enter image description here" /></a><a href="https://i.stack.imgur.com/oiIRM.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/oiIRM.jpg" alt="enter image description here" /></a></p>
  <p>I searched but didn't get any working solution. Any assistance would be a great help.</p>