Cam is a helper module for the ZIM JavaScript Canvas Framework at https://zimjs.com. With the module you can show a Webcam, and place objects at where there is motion.
A cursor can follow your finger. Or you can set interactive regions that capture motion. Multiple CamCursor objects can be used for instance to play a game of pong with paddles on each side.

// CAM 
// A cam motion cursor
// This will follow motion - read carefully the docs 
// https://zimjs.com/docs.html?items=CamMotion,CamCursor 
// as there are a lot of options!

// Apple still makes us interact with the canvas before showing video (sigh)
// so use CamAsk widget that has a callback on show() which is true for yes and false for no    
const ask = new CamAsk().show(yes => {
    
    // if the user answers yes to the CamAsk
    if (yes) {

        const camCursor = new CamCursor(new Emoji("🐙",50));
        camCursor.on("ready", () => {   
            new CamAlpha(camCursor).pos(50,50,RIGHT,TOP);
            new CamControls(camCursor.camMotion).pos(30,150,RIGHT,TOP);  
        });      
        
        // // Here is a manual way:
        // const camMotion = new CamMotion().center();    
        // camMotion.on("ready", () => {   
        //     new CamAlpha(camMotion).pos(50,50,RIGHT,TOP);
        //     const camControls = new CamControls(camMotion).pos(30,150,RIGHT,TOP);        
        // });
        // 
        // const cursor = new Emoji("🐙",50).centerReg();
        // camMotion.on("cursor", () => {
        //     cursor.loc(camMotion.motionX, camMotion.motionY);        
        // });

    }
});

import zim from "https://zimjs.org/cdn/016/zim_cam";

import zim from "zimjs"
import { CamAsk, CamCursor, CamAlpha, CamControls } from "@zimjs/cam"

• https://zimjs.com/nft/bubbling/cam.html - two motion regions
• https://zimjs.com/nft/bubbling/cam2.html - the cam cursor above
• https://zimjs.com/nft/bubbling/cam3.html - pong paddles
• https://zimjs.com/nft/bubbling/cam4.html - cam motion
• https://zimjs.com/nft/bubbling/cam5.html - hold and drag