[Unity] 加速度をつけてカメラをプレイヤーに追尾させる方法　実装方法が知りたい。

提示コード下部のMove();関数のコードですが加速度をつけてカメラをプレイヤーに追尾させたいのですがどうすれば実装出来るのでしょうか？
移動はどういった手法で行うべきなのでしょうか？色々考えましたがわかりません。

参考サイト: https://baba-s.hatenablog.com/entry/2017/11/30/113517

cs
1using System;
2using System.Collections;
3using System.Collections.Generic;
4using UnityEngine;
5
6/* ###########################################################################################
7 * カメラ追尾 
8 * 
9 * 
10 * 
11 * 
12  #############################################################################################*/
13
14public class Camera_Tracking : MonoBehaviour
15{
16    private Rigidbody rb;
17    public GameObject trackingObject;                   //追尾オブジェクト
18    public string trackingTagName;                      //追尾オブジェクト　タグ
19    public Vector2 rotationSpeed = new Vector2(3,3);    //回転速度
20    Vector2 nowMouseValue;                              //マウス感度
21    private float zoom;                                 //ズーム 
22
23
24    
25    private Vector3 lastTrackingPosition;
26    private Vector3 moveVec;
27    private bool isTracking;
28
29
30    void Start()
31    {
32        zoom = 0.0f;     
33        rb = GetComponent<Rigidbody>();
34
35
36        lastTrackingPosition = trackingObject.gameObject.transform.position;
37        //lastTrackingPosition = trackingObject.gameObject.transform.position;
38
39        isTracking = false;
40    }
41
42    void Update()
43    {
44        Cursor.lockState = CursorLockMode.Locked;
45
46
47
48        Rotate();
49        Move();
50        Zoom();
51    }
52
53
54    void Rotate()
55    {
56
57        nowMouseValue.x = Input.GetAxisRaw("Mouse X") * Time.deltaTime;
58        nowMouseValue.y = Input.GetAxisRaw("Mouse Y") * Time.deltaTime;
59
60        Vector3 newAngle = Vector3.zero;
61        newAngle.x = rotationSpeed.x * nowMouseValue.x;
62        newAngle.y = rotationSpeed.y * nowMouseValue.y;
63
64        transform.RotateAround(trackingObject.transform.position, Vector3.up, newAngle.x);
65        transform.RotateAround(trackingObject.transform.position, transform.right, -newAngle.y);
66        
67
68    }
69
70    //拡大縮小
71    void Zoom()
72    {
73        zoom = Input.GetAxis("Mouse ScrollWheel");
74        Vector3 offset = new Vector3(0, 0, 0);
75        Vector3 pos = trackingObject.transform.position - transform.position;
76
77        if (zoom > 0)
78        {
79            offset = pos.normalized * 1;
80        }
81        else if (zoom < 0)
82        {
83            offset = -pos.normalized * 1;
84
85        }
86        transform.position = transform.position + offset;
87
88    }
89
90
91////////////////////////////////////////////////////////////////////////////////////////////////////////////
92    void Move()
93    {
94        Vector3 move = trackingObject.gameObject.transform.position - lastTrackingPosition;
95
96        if(move.magnitude > 4)
97        {
98
99            //transform.position += trackingObject.gameObject.transform.position - lastTrackingPosition;
100
101            move.y = 0;
102            rb.AddForce(move);
103            isTracking = true;
104        }
105
106
107        Vector3 t = trackingObject.gameObject.transform.position - transform.position;
108        if (t.magnitude <= 4 && isTracking == true)
109        {
110            lastTrackingPosition = trackingObject.gameObject.transform.position;
111            isTracking = false;
112            rb.velocity = new Vector3(0,0,0);
113
114        }
115
116    }
117///////////////////////////////////////////////////////////////////////////////////////////////////////////
118}