title: Issue in Html 5 Qr code reader
body: <p>I am developing a mobile application, in which it uses QR code scanner.I am using the following code <code>http://dwa012.github.io/html5-qrcode/</code>. As per the instruction given in the 'Readme' file. I have wirtten the following code.</p>
  
  <pre><code> &lt;div  class="center" id="reader" style="width:300px;height:250px;"&gt;
  &lt;script type="text/javascript"&gt;
  $('#reader').html5_qrcode(function(data){
           // do something when code is read
      },
      function(error){
          //show read errors 
      }, function(videoError){
          //the video stream could be opened
      }
  );
  
  
  
  
  &lt;/script&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>But iam not getting the output, its not opening the webcam. 
  Please help in getting where i went wrong.</p>