How can I generate a thumbnail from a saved video on iOS?

Basically I have a video file saved to the app’s persistent data (there’s a very specific reason for this). I’d like to generate a thumbnail/image to use inside of Unity which represents a frame in the video. Is there an easy way to do this with U3DXT or is there a similar plugin which exists? Thanks!

I wrote a thumbnail gen plugin for Android. Looks like I’m going to have to do the same for iOS. I’ll post an update if I figure it out. Until then, any help would be much appreciated!