using System.Collections;
using UnityEngine;
using UnityEngine.UI;

public class CameraTest : MonoBehaviour
{
    WebCamTexture camTexture;
    public  Image img;//用来显示画面的ui
      
    public void Update()
    {
        if (Application.HasUserAuthorization(UserAuthorization.WebCam))
        {
            WebCamDevice[] cameraDevices = WebCamTexture.devices;
            string deviceName = cameraDevices[0].name;
            camTexture = new WebCamTexture(deviceName,1280,720,30);
            img.material.mainTexture = camTexture;           
            if (!camTexture.isPlaying)
                camTexture.Play();
        }
    }
}

首先场景中建一个Panel

新建一个material给Panel

shader选择(这个随意)

把前边建好的Panel拖到脚本上

运行