Someone has a basic example code?

I'm new at the library and I don't know how it works, I tried with this code, but I can't make it works :(

<!DOCTYPE html>
<html lang="es">
  <head>
    <title>Lector de códigos</title>
    <script type="text/javascript" src="html5-qrcode.min.js"></script>
  </head>
  <body>
    <div id="reader" style="width:300px;height:250px">
    </div>
      <script type="text/javascript">
      $('#reader').html5_qrcode(function(data){
     // do something when code is read
        },
        function(error){
          //show read errors 
        }, function(videoError){
          //the video stream could be opened
        }
      );
    </script>
  </body>
</html>

Can someone help me, please?

dwa012 / html5-qrcode

Someone has a basic example code? #66