Video effects library - how to implement?

Question

iPhone

Dear colleagues. There are a lot of games where you can buy weapons and so on for extra money.
The application we are trying to implement must work with video effects. It is planned to group these effects into libraries and download them for additional money.
However, the programmer is young, unexperienced and does not know how to implement a set of video effects in general (now it is proposed to do this as a video with a transparent alpha channel, but there is a fear that the weight of such an application will be huge), or how to implement the purchase and installation of additional ones.
Where to even dig?
Colleagues, this should not be Prism. What we want: Upload a photo. Apply one of the video effects to it, without any "neural networks" there, but one of the pre-prepared effects. The content of the photo does not change in any way, we just play the video on top of it.

Answer 1

Look towards In-App Purchase