HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>PiP toggle</title>
  <style>body{font-family:system-ui,sans-serif;margin:1rem}</style>
</head>
<body>
  <video id="player" width="360" controls src="https://interactive-examples.mdn.mozilla.net/media/cc0-videos/flower.mp4"></video>
  <p><button type="button" id="toggle">Toggle PiP</button></p>
  <pre id="out"></pre>
  <script>
    const video = document.getElementById("player");
    function logState() {
      document.getElementById("out").textContent =
        "pictureInPictureElement: " + document.pictureInPictureElement;
    }
    document.getElementById("toggle").addEventListener("click", async () => {
      try {
        if (document.pictureInPictureElement) {
          await document.exitPictureInPicture();
        } else if (document.pictureInPictureEnabled) {
          await video.requestPictureInPicture();
        } else {
          alert("PiP not enabled in this browser");
        }
      } catch (e) {
        alert(e.message);
      }
      logState();
    });
    logState();
  </script>
</body>
</html>

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pictureInPictureElement — video toggle (Try It)