So replacing the recommended code from GP:
<video loop muted autoplay poster="#" class="background-video">
  <source src="videourl" type="video/mp4">
</video>
With this:
<video playsinline autoplay muted loop poster="placeholder.jpg" id="bgvideo" width="100%" height="100%">
<source src="videourl" type="video/mp4">
</video>
Along with this CSS:
video#bgvideo {
position: fixed;
top: 50%;
left: 50%;
min-width: 100%;
min-height: 100%;
width: auto;
height: auto;
z-index: -100;
-ms-transform: translateX(-50%) translateY(-50%);
-moz-transform: translateX(-50%) translateY(-50%);
-webkit-transform: translateX(-50%) translateY(-50%);
transform: translateX(-50%) translateY(-50%);
background: url(placeholder.jpg) no-repeat;
background-size: cover;
}
Now the video shows on mobile, but it is no longer the background of the header. It is just a video playing under the title. Any ideas for getting it to be full screen / a full background video?
Thank you!