[Update] Do not know why Jishnu Sur’s camera was removed from XDA. You can download it from below links:
The stock Camera APP on LG G3 F400 models does not allow you to shoot 1080p videos at 60fps. There is no option to select the settings for 1080p videos at 60fps.
The goods is that Jishnu Sur, a developer on the xda-developers, has developed a mod for the LG G3 which brings 60 Fps 1080P video recording and more nice feature.
Jishnu’s Camera Changelog
1) Increased Bitrate of the videos, 4K : 40mbps.
2) Increased Camera preview Framerates
3) Manual Anti-Banding support added
4) Added Profile for 60 Fps 1080P video.
Thanks Jishnu Sur!