CameraFollow.cs

using UnityEngine;

public class CameraFollow : MonoBehaviour 
{

	[Tooltip("Player transform to follow")]
	[SerializeField] private Transform player;
	[Tooltip("Distance between camera position to Player transform")]
	[SerializeField] private float distance = 10;
	[Tooltip("Height of camera position from Player transform")]
	[SerializeField] private float height = 5;
	[Tooltip("Camera offset rotation to the Player")]
	[SerializeField] private Vector3 lookOffset = new Vector3(0,1,0);

	float cameraSpeed = 100;
	float rotSpeed = 100;

	void FixedUpdate () 
	{
		if(player)
		{
			//get the initialize look position and add with player position
			Vector3 lookPosition = player.position + lookOffset;
			//get the distance between the player and the camera transform
			Vector3 relativePos = lookPosition - transform.position;
			//Get rotation angle of the relativePos
        		Quaternion rot = Quaternion.LookRotation(relativePos);
			//Interpolate between the rotation angle
			transform.rotation = Quaternion.Slerp(this.transform.rotation, rot, Time.deltaTime * rotSpeed * 0.1f);
			//Get the target position minus or pplus will result to camera facing front or rear
			Vector3 targetPos = player.transform.position + (player.transform.up * height) - (player.transform.forward * distance);
			//Interpolates the previous position to taarget position
			this.transform.position = Vector3.Lerp(this.transform.position, targetPos, Time.deltaTime * cameraSpeed * 0.1f);
		}
	}
}