Cannot Follow the object properly with camera

Hello everyone. I am really new at UNITY. I am trying to make a Marble Race game. I am trying follow the Player's ball by camera. But camera does not turn by road.
I want the camera to replace by road.

here is the video and the code.

PlayerControl.cs
using PathCreation;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;

public class PlayerController : MonoBehaviour {

public float ballSpeed;
public GameObject Road1;

private Rigidbody rb;

void Start()
{
rb = GetComponent<Rigidbody>();
transform.rotation = Quaternion.Euler(0,0,0);
}

//Physics Codes
void Update()
{
//Controlling vertical and horizontal
float moveVertical = Input.GetAxis("Vertical");
float moveHorizontal = Input.GetAxis("Horizontal");


Vector3 movement = new Vector3(moveVertical, 0.0f, moveHorizontal);

rb.AddForce(movement*ballSpeed);
}

}


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CameraController.cs

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

public class CameraController : MonoBehaviour {

public GameObject player;
//public GameObject Road1;
private Vector3 offset;

// Use this for initialization
void Start () {
offset = transform.position - player.transform.position;

}

void Update()
{
transform.position = player.transform.position + offset;

}
}