how to insantiate prefab after itz gets destroyed?

i am working on endless game
prefab is my player i want to respawn it after it gets died on same position

Code (CSharp):

1. public  void playerSpawn() {
2.         if (gameOn == true)
3.         {
4.             Instantiate(playerPrefab,transform.position,Quaternion.identity);
5.         }
6.  
7.     }

and also camera is following my player prefab position ,after player gets destroyed how to access camera again to player clone

Code (CSharp):

1. //camera Script
2. private void Start()
3.     {
4.         player = GameObject.FindGameObjectWithTag("Player").transform;
5.  
6.     }
7.    
8.     // Update is called once per frame
9.     void Update()
10.     {
11.      
12.      
13.       transform.position = player.position + offset;
14.     }