loop_setup.js

var imageElement = document.getElementById('webcam');
imageElement.width = 640 // css is not enough for h/w
imageElement.height = 480 // add those here so that posenet produces non-zero outputs

async function poseHandler(pose) {
    // do stuff 
}

imageElement.addEventListener('loadeddata', async (event) => {
    const net = await posenet.load()

    while(recording) {
        const pose = await net.estimateSinglePose(imageElement, {
            flipHorizontal: true
        });

        await poseHandler(pose);
    }
});