Want to draw a video onto a canvas? Here's how simple it is.

video_to_canvas.js

function video2Canvas(video, canvas) {
    var ctx = canvas.getContext('2d');
    function draw() {
        ctx.drawImage(video, 0, 0, video.width, video.height, 0, 0, canvas.width, canvas.height);
        requestAnimationFrame(draw);
    }
    requestAnimationFrame(draw);
}