Color32[]赋给Texture2D是否太过丧病，开玩笑，我只是试一下……

using UnityEngine;
using System.Collections;

public class CameraTest : MonoBehaviour
{
    public WebCamTexture cameraTexture;
    public string cameraName = "";
    private bool isPlay = false;
    public Texture2D t;
    // Use this for initialization
    void Start()
    {
        StartCoroutine(OpenCamera());
        t = new Texture2D(320, 240, TextureFormat.BGRA32, false);
        t.anisoLevel = 9;
        t.wrapMode = TextureWrapMode.Repeat;
        t.filterMode = FilterMode.Trilinear;
    }

    // Update is called once per frame
    void Update()
    {

    }
    /// <summary>
    /// 获取权限打开摄像头
    /// </summary>
    /// <returns></returns>
    IEnumerator OpenCamera()
    {
        yield return Application.RequestUserAuthorization(UserAuthorization.WebCam);
        if (Application.HasUserAuthorization(UserAuthorization.WebCam))
        {
            WebCamDevice[] devices = WebCamTexture.devices;
            cameraName = devices[0].name;
            cameraTexture = new WebCamTexture(cameraName, 320, 240, 15);
            cameraTexture.Play();
            isPlay = true;
        }
    }

    void OnGUI()
    {
        if (isPlay)
        {
            GUI.DrawTexture(new Rect(0, 0, 320, 240), cameraTexture, ScaleMode.ScaleAndCrop);
            Color32[] c = cameraTexture.GetPixels32();
            t.SetPixels32(c); 
            GUI.DrawTexture(new Rect(0, 240, 320, 240), t, ScaleMode.ScaleAndCrop);
            
        }
    }
}