title: How to use back camera instead of selfie camera in QuaggaJS
body: <p>I have a problem opening the correct camera with QuaggaJS, On some devices, the selfie camera is opened but on others, the back facing camera will be opened. How can I set the standard camera to open to the back camera? Because scanning a barcode with your selfie camera isn't that easy...... </p>
  
  <p>This is what I've tried so far: </p>
  
  <pre><code> inputStream: {
                  type : "LiveStream",
                  constraints: {
                      width: {min: 640},
                      height: {min: 480},
                      facingMode: "environment",
                      aspectRatio: {min: 1, max: 2}
                  }
              },
  </code></pre>
  
  <p>During initialization, I've set the facing mode to environment, but still the selfie camera is opened.....  </p>
  
  <p>Maybe there is also a setting in chrome where you can change this? But I could found it......</p>