Rotate object based on FPSCamera

Im building this game that requires the rotation of an object relative to the camera in 3D space. Essentially, i have an object that is the child of an FPS camera which needs to be rotate in front of the camera acting as a third person character. I’m not interested in using mouseX or Mouse y to do this as I’m developing for VR. Help is greatly appreciated!

I’m programming beginner and someone was helping me and this is what we came up with but it’s not working:

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

public class HeadMotion : MonoBehaviour {

	public GameObject headRotationRoot;
	public Quaternion rotationFromTheHead;
	public Transform tempTransform;

	void Start () {


	// Update is called once per frame
	void Update () {

		tempTransform = headRotationRoot.transform;
		tempTransform.localRotation = headRotationRoot.transform.localRotation;
		transform.localRotation = tempTransform.localRotation;

		Debug.Log ("headRotationRoot: " + headRotationRoot.transform.localRotation.x );
		Debug.Log ("tempTransform: " + tempTransform.localRotation.x );
		Debug.Log ("transform: " + transform.rotation.x);