Unity 5.3 how recenter camera VR

Hi, a simple question
How to recetner normal VR camera in Unity 5.3?

I am starting with, but gives an error

using UnityEngine;
using System.Collections;
using VR= UnityEngine.VR;
public class recenter : MonoBehaviour {
	
	// Use this for initialization
	void Start () {
		
	}

	// Update is called once per frame
	void Update () {
		if (Input.GetKeyDown (KeyCode.R)) {
			VR.InputTracking.Recenter ();
		}
	}
}