<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<!------ Include the above in your HEAD tag ---------->
<section>
section
<div class="overlay-vid">Overlay</div>
<video playsinline="playsinline" autoplay="autoplay" muted="muted" loop="loop">
video
<source src="mp4 video link here" type="video/mp4">
</video>
<div class="d-flex h-100 text-center align-items-center">
<div class="container h-100">
<div class=" text-center align-items-center">
<div class="w-100 text-white">
<h1>Heading 1</h1>
<p>Please replace video link video tag to work background video</p>
</div>
</div>
</div>
</section>