HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>featurePolicy guard</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    function policyAllowsCamera() {
      if (!("featurePolicy" in document)) return null;
      return document.featurePolicy.allowsFeature("camera");
    }
    var result = policyAllowsCamera();
    var msg;
    if (result === false) {
      msg = "Hide camera UI — blocked by Permissions Policy";
    } else if (result === true) {
      msg = "Policy OK — still need user permission for getUserMedia";
    } else {
      msg = "Inspector missing — feature-detect getUserMedia instead";
    }
    document.getElementById("out").textContent = msg;
  </script>
</body>
</html>

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Safe camera policy guard (Try It)