JSFiddle - React, Tailwind, and code Playground

HTML

<div id="video-wrap"><video id="video">
    <source src="http://techslides.com/demos/sample-videos/small.mp4" type="video/mp4">
    Your browser does not support HTML5 video.
</video>
</div>

CSS

#video-wrap {
    position: fixed;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
}
#video {
    position: absolute;
    top: -9999px;
    bottom: -9999px;
    left: -9999px;
    right: -9999px;
    margin: auto;
    min-width: 100%;
    min-height: 100%;
    width: auto;
    height: auto;   
}