This is a Google Camera APK port of version 4.4.020 build version v1.4 ported by B-S-G.
This was a very old build from around August 2017.
Changelog of the GCam APK 4.4.020 B-S-G build version v1.4:
- Zero shutter lag (ZSL)
- Majorly ported to work on Xiaomi devices
- Ported for Snapdragon 4xx, 6xx, 8xx chipsets
This Google Camera APK is reported to be working on following devices:
- Nokia 5
- Nokia 6
- Mi 5s
- probably more devices