3D model is not moving with finger

I'm doing vuforia app with unity. I'm displaying 3D model on the camera overlay, when i apply the transform to 3d model it won't get any action with my finger.

  using UnityEngine;
     using System;
     
     public class DynamicModelsGUI : MonoBehaviour
     {    
         private GameObject metaioMan;
         public GUIStyle buttonTextStyle;
         float SizeFactor;
         
         // variables for ray tracing
         private RaycastHit hit;
         private LayerMask layerMask = 1<<4;
     
         private bool selected = false;
         private Vector3 offset = new Vector3(0.0f, 0.0f, 0.0f);
         
         void Start() 
         {
             SizeFactor = GUIUtilities.SizeFactor;
             
             // Find metaioman object
             metaioMan = GameObject.Find("plan");
         }
         
         // Update is called once per frame
         void Update()
         {    
             SizeFactor = GUIUtilities.SizeFactor;
         
             // only handle touchs or clicks when metaioman is active, i.e.
             // is visible on tracking pattern
             if (metaioMan.active)
             {
                 if (Input.touchCount > 0)
                     // if tracking, then evaluate touch point
                     handleTouches();
                 else if (Input.GetMouseButton(0))
                     handleClicks();
                 else
                     selected = false;
             }
         }
         
         private void handleTouches()
         {
             // if there's touch points and the phase is began-->try to select the geometry
             if(Input.touchCount > 0 && Input.GetTouch(0).phase == TouchPhase.Began)
                 selectGameObject(Input.GetTouch(0).position);
             
             // if the touch point is moving and metaio man is selected
             if(Input.GetTouch(0).phase == TouchPhase.Moved && selected)
                 moveGameObject(Input.GetTouch(0).position);
             else if(Input.GetTouch(0).phase == TouchPhase.Ended)
                 // deselect metaio man if touch has ended
                 selected = false;
         }
         
         public void handleClicks()
         {
             // if there's left mouse click-->try to select the geometry
             if (!selected && Input.GetMouseButtonDown(0))
                 selectGameObject(Input.mousePosition);
             
             if (selected && Input.GetMouseButton(0))
                 moveGameObject(Input.mousePosition);
         }
         
         public void selectGameObject(Vector2 position)
         {
             // get a ray from the touch point
             Ray ray = Camera.main.ScreenPointToRay(position);
                 
             // layer mask, metaio man is on layer 4
             layerMask = 1<<4;
                 
             // cast a ray on layer 4, if metaio man has been hit
             if (Physics.Raycast(ray, out hit, 5000, layerMask) && hit.collider.gameObject.name == "plan")
             {
                 // metaio man is touched --> select it
                 selected = true;
                     
                 // swith to layer 8, find the initial touch point on the plane and use it as a reference
                 layerMask = 1<<8;
                 if (Physics.Raycast(ray, out hit, 5000, layerMask))
                 {
                     // record the offset of the touch point and the object position point
                     offset = hit.point - metaioMan.transform.position;
                 }
             }
             else
                 // not hit, don't select
                 selected = false;
         }
         
         public void moveGameObject(Vector2 position)
         {
             // cast a ray on layer 8 (the plane) to calculate the hit position of the plane
             Ray ray = Camera.main.ScreenPointToRay(position);
             layerMask = 1<<8;
             if(Physics.Raycast(ray, out hit, 5000, layerMask) && hit.collider.gameObject.name == "plan")
             {
                 // move the metaio man to the intersect of the ray and the plane, offset should be accounted for
                 metaioMan.transform.position = hit.point - offset;
             }
         }
         
         public void OnGUI()
         {
             if(GUIUtilities.ButtonWithText(new Rect(
                 Screen.width - 200*SizeFactor,
                 0,
                 200*SizeFactor,
                 100*SizeFactor),"Back",null,buttonTextStyle) ||    Input.GetKeyDown(KeyCode.Escape)) {
                 PlayerPrefs.SetInt("backFromARScene", 1);
                 Application.LoadLevel("MainMenu");
             }        
         }
     }