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();
        //gameObject.transform.rotation = transform.rotation * Quaternion.AngleAxis(webCamTexture.videoRotationAngle, Vector3.up);
        WebcamResume();
    }

    // Update is called once per frame
    void Update()
    {
        var x = 0;
        var y = 0;
        var size = webCamTexture.height;

        if (webCamTexture.height > webCamTexture.width)
        {
            size = webCamTexture.width;
            y = (webCamTexture.height - webCamTexture.width) / 2;
        }
        else if (webCamTexture.height < webCamTexture.width)
        {
            size = webCamTexture.height;
            x = (webCamTexture.width - webCamTexture.height) / 2;
        }

        Texture2D cropped = new(size, size);
        cropped.SetPixels(webCamTexture.GetPixels(x, y, size, size));
        cropped.Apply();

        gameObject.GetComponent<RawImage>().texture = cropped;
        gameObject.GetComponent<RawImage>().material.mainTexture = cropped;
    }

    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);
    }
}