Unity调用手机摄像头进行摄像，并显示

核心知识：
WebCamTexture(网络摄像头材质)
关键方法：
WebCamTexture.Play()播放；WebCamTexture.Pause()暂停；WebCamTexture.Stop()停止；
例1：

public WebCamTexture webCamTexture;

public Material webCamMaterial;

IEnumerator webCam(){

yield return Application.RequestUserAuthorization(UserAuthorization.WebCam);

if (Application.HasUserAuthorization(UserAuthorization.WebCam))

{

WebCamDevice[] devices = WebCamTexture.devices;

deviceName = devices[0].name;

tex= new WebCamTexture(deviceName, 400, 300, 12);

webCamShow.mainTexture=tex;

tex.Play();

}

}