For anybody who's interested, is in the first comment of the G+ post that OP mentioned.
[APP][SENSE][M7]Camera.apk from newest 2.25 base with GIF support and better quality
So guys, ive recently playing with 2.25 base for HTC One 802w(dual sim) and found, that camera in 2.25 has a newer version.
New camera is 5.1.620655, ive flashed it to my One 801e and so far ive noticed better image quality in photo and video, also GIF-mode, but dunno whats this for, cause...GIF..seriously...its oldschool...
Here ive uploaded flashable zip with camera.apk + req. libs for it to work. For me everything is stable and working niice^)