As Xiaomi has lauched their premium mid-ranged smartphone, Redmi Note 5 Pro, the industry is trending with this smartphone. What is famous in the smartphone is the pack of the specifications which is available in in this price range.
Xiaomi has also added thei MIUI 9.2 instead of going stock android which means there are additional bloatwares and their own Xiaomi apps. So, you can imagine Xiaomi has provided their own camera apps, music app and not by Stock or Google version. Thus, the camera app is also given by Xiaomi which is kind of good.
But just in case, if you wanted Stock Camera app in this smartphone, don't worry as I have downloaded APK from the xda developers thread. You can download this camera APK in your Redmi Note 5 smartphone and use it just like Xiaomi Mi A1 has.