请写出three.js使用vue实现导入模型并在人物模型头顶添加视频代码

请参考以下代码：

在vue项目中引入three.js和OBJLoader：

import * as THREE from 'three';
import {OBJLoader} from 'three/examples/jsm/loaders/OBJLoader.js';

在Vue的template中定义canvas元素和视频元素：

<template>
  <div>
    <canvas ref="canvas"></canvas>
    <video ref="video" muted autoplay></video>
  </div>
</template>

在Vue的methods中实现加载模型和添加视频的功能：

methods: {
    init() {
      const loader = new OBJLoader();
      const scene = new THREE.Scene();
      const camera = new THREE.PerspectiveCamera(45, window.innerWidth/window.innerHeight, 0.1, 1000);
      const renderer = new THREE.WebGLRenderer({canvas: this.$refs.canvas});

      loader.load('model.obj', (obj) => {
        obj.position.set(0, 0, 0);
        obj.scale.set(0.5, 0.5, 0.5);
        scene.add(obj);

        const video = this.$refs.video;
        const texture = new THREE.VideoTexture(video);
        const material = new THREE.MeshBasicMaterial();

        material.map = texture;
        material.transparent = true;

        const geometry = new THREE.BoxGeometry(10, 10, 10);
        const mesh = new THREE.Mesh(geometry, material);

        mesh.position.set(0, 50, 0);
        mesh.visible = false;
        obj.add(mesh);

        camera.position.set(0, 100, 300);
        camera.lookAt(scene.position);

        const animate = () => {
          requestAnimationFrame(animate);

          renderer.render(scene, camera);

          if (video.readyState === video.HAVE_ENOUGH_DATA) {
            texture.needsUpdate = true;
          }
        };

        animate();
      });
    }
  },

在Vue的mounted钩子中调用init方法：

mounted() {
    this.init();
  }

这样就可以在three.js中导入模型并在人物模型头顶添加视频啦！