How can I make a thumbstick with this code? HELP

I have this code and it works fine when I attach it to the main camera, I wan't this script to be activated if I touch a thumbstick/GUItexture... When I attach the script to a guitexture nothing happens. By the way this is mouse look script from: http://unifycommunity.com/wiki/index.php?title=TouchLook

here's my code!

 using UnityEngine;
 
 [AddComponentMenu("Camera-Control/Touch Look")]
 public class TouchLook : MonoBehaviour {
     public float sensitivityX = 5.0f;
     public float sensitivityY = 5.0f;
     public bool invertX = false;
     public bool invertY = false;
 
     void Update()
     {
         if (Input.touches.Length > 0)
         {
             if (Input.touches[0].phase == TouchPhase.Moved)
             {
                 Vector2 delta = Input.touches[0].deltaPosition;
     
                 float rotationZ = delta.x * sensitivityX * Time.deltaTime;
                 rotationZ = invertX ? rotationZ : rotationZ * -1;
     
                 float rotationX = delta.y * sensitivityY * Time.deltaTime;
                 rotationX = invertY ? rotationX : rotationX * -1;
 
                 transform.localEulerAngles += new Vector3(rotationX, rotationZ, 0);
             }
         }
     }
 }