gistfile1.js

//a video tag
var video = document.getElementById('monitor');

//request it
navigator.webkitGetUserMedia({video:true}, gotStream, noStream);

function gotStream(stream) {

	video.src = webkitURL.createObjectURL(stream);
	video.onerror = function () {
		stream.stop();
		streamError();
	};
}

function noStream() {
	document.getElementById('errorMessage').textContent = 'No camera available.';
}


function streamError() {
	document.getElementById('errorMessage').textContent = 'Camera error.';
}