AVFoundation - Adding blur background to video

Question

I am working on a video editing app in Swift. In my case my output video looks like as following

I am trying to fill the black portion with blur effect e

Answer 1

Swift 4 - Adding blur background to video

1. Single video support ❤️
1. Multiple videos merging support ❤️
2. Support any canvas in any ratio ❤️
3. Save final video to camera roll ❤️
5. Manage all video orientations ❤️

May be I'm late for this answer but still I didn't find any solution for this requirement. So sharing my work: