I have already wrote it? Camera Zoom FX Premium https://play.google.com/store/apps/d...ide.cameraZoom , but I think that the free version would also let you select this option.
Aside from gcam and camera zoom I am currently testing few other apps:
HD Camera Pro (paid)
LG camera 7.1
Camera FV-5
CameraMX
Open Camera
After more than 700 pictures taken side by side with each app I have come to the conclusion that as for sharpness, details and balanced light HD Camera Pro is the best for indoors and Camera Zoom FX for outside day and night photography.
This ordeal took me over a week to do but was worth it.
The only problems with all these apps is that none of them supports the wide camera, it`s only available in the integrated samsung camera app.
I still hope for some time in the future we will got our hands on fully functional Gcam port with wide camera support. And I think that it would beat all of the above apps. I hope it would happen sooner than later.