We haven't done so yet. I think the biggest issue you might encounter is the 300' CAT6 distance limitation depending on the number of floors the elevator travels plus the distance to your nearest IDF.
@lfischer-gcpl I don't think you'd have an issue with the distance limitation then. You'd need to get CAT6 run along with the power/control cables in the shaft and then you'll have CAT6 at the car to mount the camera inside.
Wireless is also another good idea from @jdsilva but isn't available in MV12's firmware just yet.