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<!DOCTYPE html>
<html>
<body>
<video id="v" controls></video>
<script>
const v = document.getElementById("v");
function videoTrack(width = 640, height = 480) {
const canvas = Object.assign(document.createElement("canvas"), {width, height});
canvas.getContext('2d').fillRect(0, 0, width, height);
return canvas.captureStream(10).getVideoTracks()[0];
}
onload = () => v.srcObject = new MediaStream([videoTrack()]);
</script>
</body>
</html>