GazeInput.cs

using UnityEngine;

public class GazeInput : MonoBehaviour
{
    private Ray ray;
    private RaycastHit hitInfo;

    [SerializeField]
    [Tooltip("The root object of all menu items")]
    private GameObject menuRoot;

    private void Update()
    {
        if (Input.GetMouseButtonDown(0))
        {
            if (menuRoot.activeInHierarchy == false)
            {
                ShowMenu();
            }
            else
            {
                TrySelectMenuItem();
            }
        }
    }

    private void TrySelectMenuItem()
    {
        ray = new Ray(transform.position, transform.forward);
        if (Physics.Raycast(ray, out hitInfo))
        {
            var videoSelection = hitInfo.collider.GetComponent<VideoSelection>();
            if (videoSelection != null)
            {
                videoSelection.StartClipIfNotAlreadyPlaying();
                HideMenu();
            }
        }
        else
        {
            HideMenu();
        }
    }

    private void ShowMenu()
    {
        menuRoot.SetActive(true);
    }

    private void HideMenu()
    {
        menuRoot.SetActive(false);
    }
}