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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>getTracks MDN</title>
</head>
<body>
  <button id="run">Start camera</button>
  <pre id="out">Click Start (allow camera).</pre>
  <script>
    document.getElementById("run").addEventListener("click", function () {
      var out = document.getElementById("out");
      if (!window.isSecureContext || !navigator.mediaDevices) {
        out.textContent = "Need secure context + mediaDevices.";
        return;
      }
      navigator.mediaDevices
        .getUserMedia({ audio: false, video: true })
        .then(function (stream) {
          var tracks = stream.getTracks();
          out.textContent = "tracks: " + tracks.length + "\nkind: " + (tracks[0] && tracks[0].kind);
          if (tracks[0]) tracks[0].stop();
        })
        .catch(function (err) {
          out.textContent = "Error: " + err.message;
        });
    });
  </script>
</body>
</html>

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getTracks() — MDN stop video (Try It)