rafaelmperez/remove-watermark-auto ? reverse-engineered prompt

Build me a Python tool that removes a visible watermark from videos automatically, using OpenCV and a simple command line flow on Linux. I want to pick the watermark area on the first frame with the mouse, then have the script track it through the rest of the video and clean it up frame by frame, while keeping the original audio in the final file. It should work with common video formats like mp4, avi, and mov, and let me adjust the inpainting strength if the watermark is harder to remove. Please make it feel practical and easy to run from the terminal, with a progress indicator and clear output file handling. If you need to check current docs for OpenCV or FFmpeg, go ahead and look them up online.