JSFiddle - React, Tailwind, and code Playground

HTML

<video autobuffer autoplay id="myvideo">
    <source id="mp4" src="http://grochtdreis.de/fuer-jsfiddle/video/sintel_trailer-480.mp4" type="video/mp4" />
</video>
<p onclick="mute(this);">Mute</p>

CSS

html {
    padding: 20px 0;
    background-color: #efefef;
}
body {
    width: 400px;
    padding: 40px;
    margin: 0 auto;
    background: #fff;
    box-shadow: 1px 1px 5px rgba(0, 0, 0, 0.5);
}
video {
    width: 400px;
    display: block;
}

JavaScript

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

function mute(btn) {
    var muted = video.muted;
    btn.innerHTML = muted ? 'Mute' : 'un Mute';
    video.muted = !muted;
}