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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>addTrack multi</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    var a = document.createElement("canvas");
    var b = document.createElement("canvas");
    var trackA = a.captureStream().getVideoTracks()[0];
    var trackB = b.captureStream().getVideoTracks()[0];
    var composed = new MediaStream();
    composed.addTrack(trackA);
    composed.addTrack(trackB);
    document.getElementById("out").textContent =
      "tracks: " + composed.getTracks().length;
  </script>
</body>
</html>

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addTrack() — multiple tracks (Try It)