OnePlus 8 and 8 pro launched Globally on March 2020. It has great flagship level setup of cameras which is good enough. But still people want a working Gcam with good tuning of colors and natural Google photo processing. So here is the Working Google camera for both oneplus 8 and OnePlus 8 Pro .
Oneplus 8 & 8 Pro Camera
oneplus 8 – (Main) 48mp sony imx 586 f/1.75
(ultrawide) 16mp f/2.2
(macro) 2mp
(front) 16mp imx 471
oneplus 8 pro – (Main) 48mp sony imx 689 f/1.78
(ultrawide) 48mp imx586 f/2.2
(telephoto) 8mp f/2.4
(color filter) 5MP
(front) 16mp imx 471

Oneplus 8 & 8 pro Gcam Download
LMC8.4_R8 Gcam and XML – link
MGC 8.1 Gcam and XML – link
HOW TO LOAD XML FILE :-
1) Download XML
2) Open your preferred GCam
3) Double Tap in between Camera Shutter Button and Camera switch button
4) Find the downloaded xml then tap on it and apply
NOTE : slowmotion , ois may not work . check this website frequently for updated gcams .