Vertical And Horizontal Video At The Same Time?

I'm not one hundred percent certain which scenarios might trigger me needing to shoot vertical and horizontal video at the same time, I typically pick a format and just run with it. But just from the pure energy of this guy who created it, I'm gonna download it and give it a try anyway. :)

"In Dual-Lens Mode, it uses both rear cameras on supported iPhone models, typically the wide and ultra-wide lenses, to capture footage simultaneously. Alternatively, Single-Lens Mode allows users to record both portrait and landscape versions from a single camera, including support for front-facing capture."