With Collab you can use multiple iPhones or iPads to shoot video, for instance at an event, and easily blend the videos together into one in the app. The app can handle up to five phones at once. This lets you create multi-angle videos.
Download and purchase Collab today and save it for when you need it. This will save you about 5 USD campared to the regular price.
I have not used this app, but it has been featured by Apple in the App Store. One think I don’t like about the app, is that it shoots video in portrait (standing) mode.