ufo/Assets/Script/CameraFollow.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class CameraFollow : MonoBehaviour
{

    public Transform playerPos;
    public float smooth = 8;

    private Vector3 offsetPos;

    // Use this for initialization
    void Start()
    {
        offsetPos = transform.position - playerPos.position;
    }

    // Update is called once per frame
    void Update()
    {
        Vector3 camNewPos = playerPos.position + offsetPos;
        transform.position = Vector3.Lerp(transform.position, camNewPos, Time.deltaTime * smooth);
    }
}