camera.js

  var initCamera = function(videoId) {
    video = document.getElementById(videoId);
    navigator.getMedia = ( navigator.getUserMedia ||
                           navigator.webkitGetUserMedia ||
                           navigator.mozGetUserMedia ||
                           navigator.msGetUserMedia);

    navigator.getMedia(
      {
        video: true,
        audio: false
      },
      function(stream) {
        if (navigator.mozGetUserMedia) {
          video.mozSrcObject = stream;
        } else {
          var vendorURL = window.URL || window.webkitURL;
          video.src = vendorURL.createObjectURL(stream);
        }
        video.play();
      },
      function(err) {
        console.log("An error occured! " + err);
      }
    );  
  };