Hi Sentry - From inspecting the module and it’s schematic it does appear there are two zero resistor links on the board that determine if DVP_PWDN acts as a power down function (R11) or a camera selector (R12). My module came with R11 not connected and R12 populated, which reroutes DVP_PWDN to all the ENB pins on all the BL1551 analog switches (labeled as DVP_SEL in the schematic).
As far as samples goes, in a very recent commit to MaixPy (wipping added 12 days ago) you can find a simple sample binocular camera program you can start with:
Here’s what it does:
Other than the image being mirrored, it looks pretty good to me. All the key code bits here can be found in ports/k210-freertos/mpy_support/omv/sensor.c.