I am trying to develop a VR video player using latest Google VR SDK for Android (v1.0.3), but there is no high-level API to build VR playback controls.
YouTube VR player uses old version of gvr toolkit and renders controls (for example,
GVR SDK does not provide a way do draw something over VrVideoView, so we need to implement VR video by ourselves.
Then we need to implement custom controls on the scene using OpenGL ES and GVR SDK (HeadTracking, Eye, etc.).