gum_navigate.html

<html>
<meta charset=utf-8>
<button id="button">Retrigger gUM</button><br>
<video id="video" width="320" height="200" autoplay></video><br>
<script>
const console = { log: msg => div.innerHTML += msg + "<br>" };

button.onclick = async () => {
  try {
    video.srcObject = await navigator.mediaDevices.getUserMedia({video: true, audio: true});
  } catch(e) {
    console.log(e);
  }
};
button.onclick();
</script>
<a id="link" href="gum.html">Navigate to gum.html</a>
<div id="div"></div>
</html>