Night mode video

[Qotaiba]

My s21 ultra is capable of recording slow motion at 1080p 240fps, since the phone can shoot 240 frames in 1 second, my idea is to make a night time videio mode (you can find a better name for it) where the phone shoots at 1080p 240fps then combines 4 frames into 1 to make a single frame, therefore 240 frames is converted into 60 frames in 1 second, just like the way HDR works for photos, the phone will combine 4 shots of the same scene and combine them, one normal shot, one shot with brighten background, and so on.