public WebCamTexture webcamTexture;
public Quaternion baseRotation;
void Update()
{
    webcamTexture = new WebCamTexture();
    Renderer renderer = GetComponent<Renderer>();
    renderer.material.mainTexture = webcamTexture;
    int webcamAngle = webcamTexture.videoRotationAngle; //this one gave me error.
 }

Quaternion webcamAngle = new Quaternion();
webcamAngle = Camera.main.transform.rotation;
Debug.Log(webcamAngle); //this gave me (0.0, 0.0, 0.0, 1.0)