Lack of Documentation. Swift Version needed.

[asifhabib]

I rate this video reverser 5 stars because I tried around 50 video editors and all of the them kill the video quality. This is the only video editor which kept the quality intact.
I need following features:

1. Proper documentation, I could not understand the code otherwise I might have done few of the remaining features.
2. Swift version.
3. Audio Reverse feature
4. Scaling the video to fast and slow motion.

If anyone provide 1 or 2 it would be great, I can add 4.