This example is running a Processing sketch that captures webcam input, detects your face with the openCV Processing library and uses the P5Websockets library for Java to open up a websocket with your browser.
I made a slight modification of the first person mouse controls to make it updatable by an event triggered by the incoming websocket face data. Forward/back movement of the camera is still done with standard up/down/left/right keys.

Code here

Disclaimer: Three.js Minecraft map is NOT MINE, in the examples from the three.js repo here

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