Gesture lets you control on-screen effects with your hand. Thumbs-up, open palm, fist and victory each trigger something different.
It uses MediaPipe's GestureRecognizer, following one hand. The model first finds the hand and its landmarks, then classifies the shape into a named gesture on each frame. The code draws the hand skeleton and maps the result to an effect. It runs in the browser. Nothing starts until you enable the camera.
It knows only a small fixed set of gestures. Anything else is ignored.