title: How do i add CIFilter to video file imported from gallery
body: <p>What is the best approach to add filters to video files?
  Do i have to extract all frames from the video and then add filter to each frame? Or is there a better approach to this.</p>
  
  <p>Came across this, but not sure how to use it</p>
  
  <pre><code>    let vidComp = AVVideoComposition(asset: self.asset, applyingCIFiltersWithHandler: {
       request in
      })
  </code></pre>
  
  <p>Please help.</p>