VRactive.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.VR;

public class VRactive : MonoBehavior {

  public void Start()
  {
    StartCouroutine(ActivateVR("carboard"));
  }

  public IEnumerator ActivateVR(string VROn)
  {
    VRSettings.LoadDeviceByName(VROn);
    yield return null;
    VRSettings.enable = true;
  }
}