Try mods by Shamim or Greatness from the Celso Azevedo repository.
While modern Google Camera apps are built strictly for 64-bit systems, these "exclusive" mods allow legacy devices to access advanced computational photography features like HDR+ and Night Sight. Why You Need a 32-Bit Exclusive Version camera gcam 32 bit exclusive
Some developers have modded older versions of the full Google Camera app to run on 32-bit Snapdragon processors. Try mods by Shamim or Greatness from the