Projector the video

Questions
6

Not sure what you want to achieve. Try the modified code.
( adapted from https://jsfiddle.net/f2Lommf5/6321/ )
The video can be placed on different geometries.

<!DOCTYPE html>

<head>
  <title> Video </title>
  <meta charset="utf-8" />
  
</head>

<script src="https://cdn.rawgit.com/mrdoob/three.js/master/build/three.min.js"></script>
<body>


<video id="video" autoplay loop crossOrigin="anonymous" webkit-playsinline style="display:none">
  <source src="https://cdn.rawgit.com/mrdoob/three.js/master/examples/textures/sintel.ogv" type='video/ogg; codecs="theora, vorbis"'>
  <source src="https://cdn.rawgit.com/mrdoob/three.js/master/examples/textures/sintel.mp4" type='video/mp4; codecs="avc1.42E01E, mp4a.40.2"'>
</video>

  
<script> 
var camera, scene, mesh, renderer;

init();
animate();

function init() {

    camera = new THREE.PerspectiveCamera( 70, window.innerWidth / window.innerHeight, 0.01, 10 );
    camera.position.set( 0, 0, 2 );

    scene = new THREE.Scene();
    
    var video = document.getElementById( 'video' );
    
    var texture = new THREE.VideoTexture( video );
    texture.minFilter = THREE.LinearFilter;
    texture.magFilter = THREE.LinearFilter;
    texture.format = THREE.RGBFormat;
    
    var geometry = new THREE.BoxBufferGeometry( 2, 1, 0.1 );
	
	var material1 = new THREE.MeshBasicMaterial( { color: 0x0000ff, side: THREE.DoubleSide } );
	var material2 = new THREE.MeshBasicMaterial( { color: 0xff00ff, side: THREE.DoubleSide } );
	var material3 = new THREE.MeshBasicMaterial( { color: 0xffff00, side: THREE.DoubleSide } );
	var materialTransparent =  new THREE.MeshBasicMaterial( { transparent: true, opacity: 0, wireframe: true, side: THREE.DoubleSide} );
	
   	var materialVideo = new THREE.MeshBasicMaterial( { map: texture , side: THREE.DoubleSide } );
	
	var materials = [ material1, material1, material2, material2, materialTransparent, materialVideo ]

    mesh = new THREE.Mesh( geometry, materials );
    scene.add( mesh );

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

}

function animate() {

    requestAnimationFrame( animate );
	mesh.rotation.y +=0.01;
    renderer.render( scene, camera );
	

}
</script>

</body>
</html>

Textures can also be displayed on grids.
https://discourse.threejs.org/t/grid-collection/1893