Document the process to record ZED footage in real time during an experiment

[Carleton-SRCL]

Two options to document:

(1) Record while simultaneously running a pose determination process on the TX2
(2) Only record with the TX2

For both options, saving ground truth data is also required.

[TheElectricDream]

I have written this entry: https://github.com/Carleton-SRCL/SPOT/wiki/Recording-ZED-Footage

However, this could be better automated (and the code slows down algorithms as well). Would like to create a nice python script that is independent of any algorithm, which could be started and stopped from the GUI. Like a "record ZED" button. Could then have the script constantly publish the ZED data over UDP, and then any algorithm that needs the images could just grab them from a UDP port.