Seems like a good app – Slowmo - SlowMo Video Analysis Review

This plays back videos in adjustable slow motion and can do frame by frame forward and backwards. You can compare two videos side by side and link them to play together, nice feature. It just has a couple bugs on my iPad that need worked out and I would pay for it and rate it 5 stars. Very nice for golf swing analysis, better than v1 golf.
Review by Whisper3413 on Slowmo - SlowMo Video Analysis.