Offscreen indicator is a new asset wich can enable you to track with a Unity UI Image some gameObjects outside (and inside) screen bounds.
Very usefull for radar like systems, minimaps, or for a tutorial to help the user to find what to do and catch his attention on particular gameObjects.
No code is needed although a full API support is present.
Since the asset needs to refer to UI components, you just need to have a world space canvas binded to your VR camera. So, the asset will work has expected in VR.
The examples included in the asset are screen space overlayed, but you can change it as you need.