Camera

using UnityEngine;

public class PlayerCamera : MonoBehaviour
{
    Transform tx;
    [SerializeField] Transform tx_player;

    [SerializeField] Vector3 offset = new Vector3(0, 1, 0);
    [SerializeField] float smoothTime = 0.8f;

    private Vector3 Velocity;
    private Vector3 offsetsubstract;
    private Vector3 current;

    void Start()
    => tx = transform;

    void Update()
    {
        current = tx.position;
        current -= offsetsubstract;
        tx.position = offset + Vector3.
            SmoothDamp(current, tx_player.position, ref Velocity, smoothTime);
        offsetsubstract = offset;
    }
}