JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://cdn.jsdelivr.net/npm/three@0.142/build/three.min.js"></script>
<video id="video" loop muted crossOrigin="anonymous" playsinline style="display:none">
  <source src="https://threejs.org/examples/textures/sintel.ogv" type='video/ogg; codecs="theora, vorbis"'>
  <source src="https://threejs.org/examples/textures/sintel.mp4" type='video/mp4; codecs="avc1.42E01E, mp4a.40.2"'>
</video>

CSS

body {
	  margin: 0;
}

JavaScript

let camera, scene, renderer;

init();
animate();

function init() {

    camera = new THREE.PerspectiveCamera( 70, window.innerWidth / window.innerHeight, 0.01, 10 );
    camera.position.z = 1;

    scene = new THREE.Scene();
    
    const video = document.getElementById( 'video' );
    video.play();
    
    const texture = new THREE.VideoTexture( video );
    scene.background = texture;

    renderer = new THREE.WebGLRenderer( { antialias: true } );
    renderer.setPixelRatio( window.devicePixelRatio );
    renderer.setSize( window.innerWidth, window.innerHeight );
    document.body.appendChild( renderer.domElement );

}

function animate() {

    requestAnimationFrame( animate );
    renderer.render( scene, camera );

}