Built in image panels can be parented to the view with this;
I changed the license from CC BY-NC to CC BY-SA at the suggestion of @AshAuryn. You can use it for paid content. However, please refrain from distributing it together with paid content. This plugin allows atoms such as lighting and UI panels to...
hub.virtamate.com
I don't know if this was ever updated, but previously when I tried, anything parented to the camera rig (or the "center eye") would not persist when loading the scene again. This plugin by ky1001 fixed that for me. Be aware though, parenting something to the center eye can be a bit nauseating in vr. Picking a tracker as the target makes it easier, as the parented object stays pinned infront, but doesn't track the jittery motion of the headset.