Some sports have long fields/courts where action happens at the opposite end from your seats.  If you want to see a replay of the action from an angle not provided by the stadium (or not at all in the case of amateur sports) - this app will allow you to see the replays.

Incentives for people to shoot the video include royalties on the replays if purchased from the website by fans at home or media outlets looking to report on the game from several angles.

In the case of poor wifi or cellular coverage, the app could enroll users on an ad-hoc mesh network.

Stanford rolled out a mobile replay system for their football team, however they control the replays and the app - which means they're making money on ads and you are limited to the replays available to view.  Could not find any evidence that the replays were available after the game for consumption/sharing.

I have a software development background, so I could assist in building the product.