Pick one. Download it. Start a new Library in iMovie. Add the YouTube as an Event. Start a new Movie, drag the video in. Go back to YouTube (or Tumblr or Google Images or anyplace) and get video/stills to use as quick cutaways to illustrate John or Hank is talking about. If your original video is not studded with quick cuts, maybe find a section to use a slow pan in…
https://www.youtube.com/watch?v=Wb6JPZ-wFmw?autoplay=0
https://www.youtube.com/watch?v=JFiApf_m4H0?autoplay=0
https://www.youtube.com/watch?v=6KQ1sM2dGps?autoplay=0
https://www.youtube.com/watch?v=u90dGnKhhlk?autoplay=0
Understanding Film 