The rotating axis for the camera is in progress.  The junk pile was full of steppers, but only had one decent reducer.  The gears meshing has a little backlash in it, but I am curious to see if it will work for the end effect of the video.  It also has a little play axially, but a spring tensioner should help mitigate some of that.  Using Fusion, the design that I came up with is below:

The risers were 3D printed and then drilled/tapped for 8-32 screws.

Checking clearances with the risers mounted:

Seeing no real issues, I moved forward with machining off the gear retainer that looks to be press fit into the shaft:

With the cap machined off, the gear could be removed and the shaft indicated in to drill/tap an 8-32 hole:

A screw in the freshly tapped hole:

The camera mount will be mounted to the adapter that is super glued to the top of the gear. . . But first the adapter needs holes located, drilled and tapped for 4-40 FHCS:

Camera mount attached to adapter:

The camera mount was removed to finish out the spring tensioner on the gear.  This tensioner is meant to keep the gear pushed down at all times and remove some play that I was concerned about:

A washer was 3D printed to retain the spring:

With the screw and spring removed, the adapter was super glued to the top of the gear:

Before mounting the camera to the adapter, I plan on drilling and tapping 4-40 holes that will help attach the gear to the adapter.  

Next up is to get wiring ran to the stepper motor and update the code to allow for a single pot control both axis for the time being.