<!--
    Ideally these elements aren't created until it's confirmed that the 
	client supports video/camera, but for the sake of illustrating the 
	elements involved, they are created with markup (not JavaScript)
-->
<video id="video" width="640" height="480" autoplay></video>
<button id="snap">Snap Photo</button>
<canvas id="canvas" width="640" height="480"></canvas>

<script>// Put event listeners into place
window.addEventListener("DOMContentLoaded", function() {
	// Grab elements, create settings, etc.
	var canvas = document.getElementById("canvas"),
		context = canvas.getContext("2d"),
		video = document.getElementById("video"),
		videoObj = { "video": true },
		errBack = function(error) {
			console.log("Video capture error: ", error.code); 
		};

	// Put video listeners into place
	if(navigator.getUserMedia) { // Standard
		navigator.getUserMedia(videoObj, function(stream) {
			video.src = stream;
			video.play();
		}, errBack);
	} else if(navigator.webkitGetUserMedia) { // WebKit-prefixed
		navigator.webkitGetUserMedia(videoObj, function(stream){
			video.src = window.webkitURL.createObjectURL(stream);
			video.play();
		}, errBack);
	}
	else if(navigator.mozGetUserMedia) { // Firefox-prefixed
		navigator.mozGetUserMedia(videoObj, function(stream){
			video.src = window.URL.createObjectURL(stream);
			video.play();
		}, errBack);
	}
}, false);

//Trigger photo take
document.getElementById("snap").addEventListener("click", function() {
	context.drawImage(video, 0, 0, 640, 480);
});

//Converts canvas to an image
function convertCanvasToImage(canvas) {
	var image = new Image();
	image.src = canvas.toDataURL("image/png");
	return image;
}
</script>
 <div id="button1">
        <button type="button" target=index.html;>Click
<a href="index.html">Page1</a></button>

I have this coding that I got from a website , for taking photos and video:     

Is there something wrong becuase the report say it does not work. Need help to correct it.