Two approaches to draw the current frame from video element on a canvas in regular intervals

draw-video-game-loop.js

function draw() { // Global function for displaying the game, this is called in a game loop
	drawVideo(currentVideo);
	// ... display other elements ...
}

draw-video-on-canvas.js

var video1 = $("#video1");
var canvas = $("#myCanvas");
var ctx = canvas[0].getContext("2d");
var timerID;
 
function drawImage(video) {
	ctx.drawImage(video, 0, 0, 640, 360);
}
 
video1.on("play", function () {
	timerID = window.setInterval(function () { drawImage(video1[0]); }, 30);
});