If it’s not related to the sphere setup and strictly related to the movie texture, and if you have nothing else drawing after the movie texture, then you might be good to grab the MoviePlayer14.java from 4.15 branch.
There is a problem with the android movie player texture not being flushed properly or something like that.
To test quickly if that’s the problem you’re having, bring the console (4 finger tap) a do a ‘stat fps’. that will draw UI after the movie texture and trigger the flush, thus fixing what you see in the gearVR. That’s how it worked for me at least.
See the bottom of this thread and the answer from Chris Babcock for more info:
Hope it helps.