First, you can tap "swings" on the home screen, or choose "Swings" from the side menu.
Tap the video you wish to play. You will see a menu with options, tap "Play". A screen will pop up and load your video for playback at full speed.
If you would like to replay your video with scrubbing (frame by frame) capability, tap "Analyze Video" from the menu as shown above. On this screen, you can draw line annotations, record your voice, and scrub the video frame by frame.