making a camera that moves depending on mousepos.y

So im trying to make it so when the mouse moves down, the camera moves from above the player looking down, to backwards, downwards, and still looking at the player.

 using UnityEngine;
 using System.Collections;
 
 public class CameraController : MonoBehaviour {
     
     public int Sensitivity;
     
     private float MouseY;
     private float MouseYSet;
     private float CameraAngle;
 
     public GameObject CameraTarget;
     
     void Start () {
         
     }
     
     void Update () {
         // Rotation controls
         MouseY += Input.GetAxisRaw ("Mouse Y");
         transform.localRotation = Quaternion.Euler (Mathf.Clamp (transform.localRotation.x, -90, 90), transform.localRotation.y, transform.localRotation.z);
         transform.localPosition = new Vector3 (transform.localPosition.x, Mathf.Clamp (transform.localPosition.y, CameraTarget.transform.localPosition.y, CameraTarget.transform.localPosition.y + 50), Mathf.Clamp (transform.localPosition.z, CameraTarget.transform.localPosition.z, CameraTarget.transform.localPosition.z + 50));
         CameraAngle = Vector3.Angle (transform.position, CameraTarget.transform.position);
         if (MouseYSet != MouseY)
         {
             transform.localRotation = Quaternion.Slerp (Quaternion.Euler (transform.localRotation.x, transform.localRotation.y, transform.localRotation.z), Quaternion.Euler (transform.localRotation.x - (MouseY - MouseYSet), transform.localRotation.y, transform.localRotation.z), (MouseY - MouseYSet) * Sensitivity * 10 * Time.deltaTime);
             transform.localPosition = Vector3.Slerp (new Vector3 (transform.localPosition.x, transform.localPosition.y, transform.localPosition.z), new Vector3 (CameraTarget.transform.position.x, transform.position.y - (MouseY - MouseYSet), CameraTarget.transform.position.z), (MouseY - MouseYSet) * Sensitivity * 10 * Time.deltaTime);
             MouseYSet = MouseY;
         }
     }
 }