title: is it possible to capture from an element with cross origin data?
body: <p>i have this simple script that i found in the webRTC doc i triet to run it but it seems i'm missing something </p>
  
  <pre><code>const leftVideo = document.getElementById('leftVideo');
  const rightVideo = document.getElementById('rightVideo');
  
  leftVideo.addEventListener('canplay', () =&gt; {
  const stream = leftVideo.captureStream();
  rightVideo.srcObject = stream;
  });
  </code></pre>
  
  <p>i get this error on stream capture when i inspect it 
  Uncaught DOMException: Failed to execute 'captureStream' on 'HTMLMediaElement': Cannot capture from element with cross-origin data
      at HTMLVideoElement.leftVideo.addEventListener
   this my index.html</p>
  
  <pre><code>&lt;video id="leftVideo" playsinline controls loop muted&gt;
      &lt;source src="test1.webm" type="video/webm"/&gt;
      &lt;p&gt;This browser does not support the video element.&lt;/p&gt;
  &lt;/video&gt;
  
  &lt;video id="rightVideo" playsinline autoplay&gt;&lt;/video&gt;
  </code></pre>