title: How to allow Chrome to access my camera on localhost?
body: <p>I cloned a project about real-time image processing on a web browser from this <a href="http://paulrhayes.com/experiments/webcam/mask.html">link</a>:
  Then I could not allow my browser to access my camera.
  I got this javascript alert:</p>
  
  <blockquote>
    <p>Uh-oh, the webcam didn't start. Do you have a webcam? Did you give it
    permission? Refresh to try again.
    And the allow button is not shown as if I access his site.</p>
  </blockquote>