Unmute video using device volume buttons

Question

I am trying to unmuting the muted video by using device volume buttons (like instagram or whatsapp status)

This code is not working as I thought from my research:

var video1 = document.getElementById('bgvideo');

document.addEventListener('keydown', function(event) {
  if (event.keyCode === 38) {
    `Volume up key`
    if (video1.muted === true) {
      video1.muted = false;
      navigator.mediaSession.setVolume(1);
    } else {
      navigator.mediaSession.setVolume(navigator.mediaSession.volume + 0.1);
    }
  }
});