How to disable Mouse Look On Pause Menu??

Hi Guys... My Game has a pause menu "Press Escape In Game It Pauses" But if you move the mouse around to select options/quit/resume etc the actual scene in BG moves since mouse look is enabled... Is there a way to find the Firstperson controller prefab and disable the mouse look script and then on resume re enable it?

using UnityEngine; using UnityEngine.UI; using System.Collections;

public class PauseMenuScript : MonoBehaviour {

 public GameObject pausePanel;
 
 public bool isPaused;
 private MouseLook mouseLook;
 
 void Start () {

     isPaused = false;

 }

 void Update () {
     if (isPaused) {
         PauseGame(true);        
     }
     else {
         PauseGame(false);    
     }

     if (Input.GetButtonDown ("Cancel")) {
         SwitchPause();        
     }
 
 }

 void PauseGame(bool state){
     if (state) {
         Time.timeScale = 0.0f;
         GetComponent<MouseLook>().enabled = false; 

     } 

     else {
         Time.timeScale = 1.0f;
         GetComponent<MouseLook>().enabled = true;
             
     }
     pausePanel.SetActive (state);
 }

 public void SwitchPause(){
     if (isPaused) {
         isPaused = false;        
     }

     else {
         isPaused = true;    
     }
 }

}