video.html

// User clicks to play
<video playsinline controls preload disablePictureInPicture poster="" controlslist="nodownload" style="cursor: pointer;">
  <source src=" type="video/mp4">
</video>

// Autoplay
<video id="backgroundVideo" class="parallax-video" autoplay="autoplay" playsinline muted loop preload disablePictureInPicture controlslist="nodownload">
  <source src="" type="video/mp4">
</video>
<script>
  var bgVideo = document.getElementById('backgroundVideo');
  bgVideo.muted = true;
  bgVideo.play();
</script>