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window.addEventListener("DOMContentLoaded", function() {
	var canvas = document.getElementById("canvas"),
		context = canvas.getContext("2d"),
		video = document.getElementById("video"),
		videoObj = { "video": true },
		errBack = function(error) {
			console.log("ulusanyazilim.com::error", error.code); 
		};
	if(navigator.getUserMedia) {
		navigator.getUserMedia(videoObj, function(stream) {
			video.src = stream;
			video.play();
		}, errBack);
	} else if(navigator.webkitGetUserMedia) {
		navigator.webkitGetUserMedia(videoObj, function(stream){
			video.src = window.webkitURL.createObjectURL(stream);
			video.play();
		}, errBack);
	}
	else if(navigator.mozGetUserMedia) {
		navigator.mozGetUserMedia(videoObj, function(stream){
			video.src = window.URL.createObjectURL(stream);
			video.play();
		}, errBack);
	}
}, false);
<video id="video" width="640" height="480" autoplay></video>
<canvas id="canvas" width="640" height="480"></canvas>

 

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