Create minimal example of object detection from picamera image stream #22
Description
Would be good to have a script analogous to classify_continuously.py in utilities/ that does object detection on a stream of images captured through a picamera instead of classification. The script objdetect_continuously.py is sort of this but it is much heavier, touching a lot of extra pieces so isn't as much of a minimal example of this base functionality. Such a proposed script will have the usual utility of testing that semi-isolated subsystems are working when debugging a ScrubCam system and of acting as a high-level unit test during software development, but this is also a good time to make such a script as we switch from picamera to picamera2 in scrubcam and could use a minimal example of how one uses picamera2 in place of picamera for this purpose before we migrate the rest of scrubcam to picamera2. (tagging @kgarwoodsdzwa as she's active on the dev of all this and we were just talking about things related to this plan/issue)