Tape a Micro bit to the back of your phone and turn it around. If you don't have a Micro Bit, I also figured out how to support it with video sensing. Just make sure to Fullscreen is recomended.
An attempt at making a VR engine with native Scratch tools I thought I'd share it before I'm done with it so people can see the progress. This was inspired by a person I saw who tried to make a VR game, but gave up because he insisted on using an expensive goDirect 3D done with TheGreenFlash's clone based 3D engine (at least part of it, I'll finish the tutorial later)