<meta name="viewport" content="width=device-width, initial-scale=1">

* {

box-sizing: border-box;

}

body {

margin: 0;

font-family: Arial;

font-size: 17px;

}

#myVideo {

position: fixed;

right: 0;

bottom: 0;

min-width: 60%;

min-height: 60%;

}

.content {

position: fixed;

bottom: 0;

background: rgba(0, 0, 0, 0.5);

color: #f1f1f1;

width: 100%;

padding: 20px;

}

#myBtn {

width: 200px;

font-size: 18px;

padding: 10px;

border: none;

background: #000;

color: #fff;

cursor: pointer;

}

#myBtn:hover {

background: #ddd;

color: black;

}

<video autoplay muted loop id="myVideo">

<source src="fn.mp4" type="video/mp4">

Your browser does not support HTML5 video.

<div class="content">

<h1>Heading</h1>

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<button id="myBtn" onclick="myFunction()">Pause</button>

var video = document.getElementById("myVideo");

var btn = document.getElementById("myBtn");

function myFunction() {

if (video.paused) {

video.play();

btn.innerHTML = "Pause";

} else {

video.pause();

btn.innerHTML = "Play";

}