Feeds around the city. >> we layer in computer vision algorithms that make it possible to detect and count people. >> reporter: using online traffic video feeds, it tracks about 10 million people a day. they can even count how many people are inside a building. the city is already using the data, providing pedestrian counts to small business owners in the city's online business atlas. and there is promising potential for integration with consumer apps. >> if our data was instead of yelp or google maps, you could set up an alert telling you that restaurant you always wanted to try but is always...