Snaparazzi/Assets/Scripts/CameraManager.cs

using UnityEngine;
using UnityEngine.UI;

public class CameraManager : MonoBehaviour
{
    public WebCamTexture webCamTexture;
    public Button freezeButton;
    public Button resumeButton;

    // Start is called before the first frame update
    void Start()
    {
        webCamTexture = new WebCamTexture();
        WebcamResume();
    }

    // Update is called once per frame
    void Update()
    {
        gameObject.GetComponent<RawImage>().texture = webCamTexture;
        gameObject.GetComponent<RawImage>().material.mainTexture = webCamTexture;
    }

    public void WebcamResume()
    {
        webCamTexture.Play();
        freezeButton.gameObject.SetActive(true);
        resumeButton.gameObject.SetActive(false);
    }

    public void WebcamChange()
    {
        foreach (WebCamDevice webCamDevice in WebCamTexture.devices)
        {
            if (webCamTexture.deviceName != webCamDevice.name)
            {
                webCamTexture = new WebCamTexture(webCamDevice.name);
                WebcamResume();
            }
        }
    }

    public void WebcamStop()
    {
        webCamTexture.Stop();
        freezeButton.gameObject.SetActive(false);
        resumeButton.gameObject.SetActive(true);
    }
}