Custom Video Player with Caption Control

I'm looking for a seasoned developer to create a video player that works seamlessly on both web and mobile platforms. This player should be able to handle multiple video formats such as MP4, WEBM, and AVI. A key aspect of this project is the implementation of a caption system where captions can be toggled on and off by the user.

Key requirements include:
- Extensive experience in video player development using Python
- Proficiency in web and mobile development
- Knowledge of various video formats
- Ability to create a user-friendly toggle system for captions

Please ensure that all source code is compatible with our development setup and is handed over