Program writing based on FFmpeg

Offering remote work for the programmer. You need to write a program based on FFmpeg. You need software for an interactive platform. The bottom line is this: a person stands on a platform around which the GoPro camera revolves and then a slowmotion video is obtained.
Task: write a program with the following functionality:
1. When a new file appears on the camera (Gopro camera connects via wifi, then the network accesses it only through ip), the program must automatically take it for further work. This means that you need constant monitoring of the camera. Or video capture in real time, I don't know which is easier.
2. There should be a possibility of selecting the length of the final roller, selective slowing of segments (that is, suppose that at the beginning of the video comes with a standard speed, in the middle double deceleration, in the end again with the usual). The slowdown is caused by the change in fps.
3. Then the video file is superimposed audio (pre-selected) and overlay.
4. Save the file in .mp4 format (the ability to select the resolution of the video)
!!!!! If you are not ready to work on a secure transaction, or through a third-party guarantor service, please do not write. There will be no prepayment (even under the contract).