Question Vr Control with reticle pointer

Hi
I'm developing for Google cardboard with no controllers
There are a few controls that I need such as move, stop, help, play. I can't work out how to have a permanent panel for these. I don't think a HUD would work as I won't know when the user is accessing the game or the hud. Are there any design solutions that might help me?

At the moment I look at the floor to start and stop and control films with a panel that doesn't move with my head... All a bit clunky and I need to add some other options

Any help gratefully received
Thanks