I've extracted the V30 camera app as it is one of the best out there and uploaded it for all of you lovely folks.
Download it here: https://drive.google.com/open?id=1oW...eHfQf-qpoQxg4B
EDIT: Doesn't work. Sorry!
Credit to @Astrako for the original apk in the H-ROM V30 port for the LG G4