I have just been playing around with a great set of apps that can really help if you are looking at video use in lessons.
Crop is an app aimed at user of devices that like to film in portrait mode but when they share the video to a TV they get the black bars down the side. In this app you simply take your portrait video and crop out areas you do not need. The result is a video that plays nicely on a TV. Again in a practical setting you can crop to focus more on certain parts of the video
Finally Fly is a great app that lets you have multi angle shots and instantly become a director by choosing which shot you use in your video. For example film someone in PE from multiple angles doing a skill and then create a movie showing that skill from all angles.