That's not very successful attempt, I think. But I still gonna upload it.
I've tried to capture in 1080p, and then upscale with gigapixel, but it's much slower, than just capture in 4k
(tho, capture in 4k require switching display to 4k DSR mode, and it's clunky and slow)
(also my method of capturing, probably not the great, currently it's just software I've made that capture screenshot every N milliseconds)