title: How do I apply a filter to a prerecorded video?
body: <p>I want to apply some filters (like a sepia tone, black and white, etc.) to a video file that is stored locally and save the filtered video in the application's documents directory.</p>
  
  <p>I don't want to add a filter to live video. I have searched, but all of the questions I've seen are about applying filters to live video, not prerecorded ones.</p>
  
  <p>Can someone please suggest where I can start with this?</p>