Vanish Question

Exist a way of a making a player group (espectadors) to make tem vanish and not seen for a playing player but able to be seen by a staff that teleport to them (the staff is not on the espectador group) and the staff is híden from all normal players but he can see all ?

 

I have alreday this code:

Code (Java):

@EventHandler
public void onPlayerKill(PlayerDeathEvent event) {
Player player = event.getPlayer();
   
     if (PengPlugin.isPlaying(player) { // Check if the player is plaing
         PengPlugin.spectador.put(player.getWorld(),player); // Map<World,Player>
        for (Player a: Bukkit.getServer().getOnlinePlayers()) {
            if (a.getWorld().equals(player.getWorld()) {
                // TODO hide player
            }
        }
    }
}