Hi @zzy,
Ok. I tried Sample scene (with VR) using my Xiaomi Redmi Note 5. On the one side, I've not installed any NDK in Unity (as you can see in the first screenshot), I didn't know that I needed NDK camera 2 API. On the other side, I don't know if that make my phone failed when it trys to use the NDK (second screenshot). Finally, I am sure that camera permission is available (third screenshot -> Viewport app).
May it be fixed if I set NDK Camera 2 API in Unity settings (first screenshot)? If it will be possible, where can I get that NDK?
Thanks so much in advance,
Danisinu