Create a converter script to extract individual images from the stream

[M-Davies]

This is needed for AWS Custom Labels (which cannot take a stream as input) which we need for gesture recognition. We will need to figure out how many frames to extract and how often (needs to be limited). https://theailearner.com/2018/10/15/extracting-and-saving-video-frames-using-opencv-python/ seems like a good tutorial to start with.

[M-Davies]

Due to the need to get the gesture recog functioning ASAP, I'm going to make the executive decision to pull this into sprint 4 so we have a baseline gesture script to work with (pushing back #5 to Sprint 5 in the process)