syahdanfx/Retrolens ? reverse-engineered prompt

Build me a fun Python app that uses my webcam to make a real time portal effect with hand tracking.

I want to spread both hands apart to open a portal, and only the area inside the hand shape should get stylized. Include a few different looks like dual tone, thermal, sketch, and glitch, and let me switch between them with a pinch gesture using my thumb and pinky. It should also let me toggle between 2D and 3D style viewing with a fist gesture or a keyboard shortcut.

Please make it easy to run from one main Python file, with clear install steps and sensible defaults for webcam use. Add keyboard controls for next and previous filter, screenshot, and quit. If you need to check current MediaPipe or OpenCV guidance, look it up online. Keep it smooth, responsive, and beginner friendly.