

Ovde pise da moze.Make sure you have turned on the option for "Unknown Sources" under Settings > General > Security.
First you need to decide which version of the apk to download onto your phone. If you are using a 100% stock unrooted G2 you will choose the 1st link. If you are rooted and wish to add the 4kUHD video mode, you will first need to flash (via twrp) a modified media_profiles.xml file and then choose the 2nd link. If you are currently using a rom that has the advanced driver (ask in your rom's thread, not here) you will choose the 3rd link.
XCam LG - for stock/unrooted G2
XCam LG - for stock G2 + 4kUHD video
XCam LG - for G2 using the advanced driver