In the BeginnerExample of the Collection of examples from discourse.threejs.org I have a working video.
Different forms are possible.
<body>
<!-- // ======== to step 04 ======== - free video at Federico Maderno / Pixabay -->
<video id="video" loop crossOrigin="anonymous" playsinline style="display:none" >
<source src="[Robin - 21375.mp4](https://hofk.de/main/discourse.threejs/BeginnerExample/Robin%20-%2021375.mp4)" type='video/mp4; codecs="avc1.42E01E, mp4a.40.2"'>
</video>
</body>
// ... step 04:
...
// ----------------------------------------------------------------------------
// https://threejs.org/docs/index.html#api/en/textures/VideoTexture (see video tag in HTML body)
const videoTexture = new THREE.VideoTexture( video );
videoTexture.minFilter = THREE.LinearFilter;
videoTexture.magFilter = THREE.LinearFilter;
videoTexture.format = THREE.RGBFormat;
const videoGeometry = new THREE.CircleGeometry( 0.6, 72 );
const videoMaterial = new THREE.MeshBasicMaterial( { map: videoTexture , side: THREE.DoubleSide } );
const videoMesh = new THREE.Mesh( videoGeometry, videoMaterial );
videoMesh.scale.set( 1.5, 1, 0 );
videoMesh.rotation.y = -0.7; // radiant
videoMesh.position.set( 2.7, -0.3, -1.9 );
scene.add( videoMesh ); // note startVideo, stopVideo in function animate
