A mirrored 16:9 webcam surface — a video element with a pixel-aligned transparent canvas overlay for landmark / skeleton drawing, an FPS badge, and a child slot. A shell for the MediaPipe streaming trackers (useDetectHands / useDetectPose / useDetectFace / useRecognizeGesture); the app supplies the stream and draw callback.
pnpm dlx shadcn@latest add "https://localmode.ai/r/ui/media-vision/video-canvas.json"