This is the Google Camera 6.1.021 APK download for Zenfone 5z.
This Gcam APK was actually built for Xiaomi Poco F1 which runs on the same Snapdragon 845 as the Zenfone 5z. Some users have reported that this Gcam APK works on Zenfone 5z too.
The Pixel Camera APK or well known as Google Camera APK is a Camera app for Android devices typically only available for Google Pixel device. But there is a Google Camera APK port available for almost every Android phone out there which is ported by some developer.
Visit the following link to download Google Camera APK for Asus phones.
For more GCam APK files for other Android phones, visit the following Google Camera APK download page.