opentrack/opentrack ? reverse-engineered prompt

Build me a head tracking app called opentrack that lets a user move their head and send that motion into flight simulators and similar games.

I want a simple desktop app with a clear setup screen where I can pick a camera or other input source, choose how the tracking is smoothed or filtered, and then send the result out through different game protocols like virtual joystick, UDP, and flight sim integrations. It should work on Windows and Linux first, and keep the code organized so new trackers and output methods can be added later.

Please include a basic GUI for live tracking, profile saving, presets, and a way to test that the head pose is being detected correctly. If any current docs or protocol details are needed, look them up online and follow the existing project style.