This is a hack for the DC Great Streets hackathon put on by the District of Columbia government. Twitter hashtags for this event were #innomaytion and #GShackathon.
This requires a Raspberry Pi with a Raspberry Pi camera. The main hack is to call the Raspberry Pi camera using SSH from within node to skip deploying any code to the Pi.
The app has as server and browser front-end. The server gets a picture stream from pi via ssh/node child processes, pipes jpegs through openCV, does person detection, and sends data over a websocket to the browser with a virtual-DOM library that refreshes the view.
index.js - server
lib - modules using camera and openCV
src - front-end code
Change lib/ssh-cam.js to ssh to your Pi—this is the hacky bit.
Uses Node v4+ or whenever spreads were introduced. The front-end uses requires a browser supporting template literals.
Check out the watch, build, and dbg npm scripts in package.json to build and run the app in debug mode