China is pursuing an ambitious plan to make an omnipresent video surveillance network to track where people are and what they’re up to. The Post’s Simon Denyer looks at the technology that will make this possible. Subscribe to The Washington Post on YouTube: http://bit.ly/2qiJ4dy Follow us: Twitter: https://twitter.com/washingtonpost Instagram: https://www.instagram.com/washingtonpost/ Facebook: https://www.facebook.com/washingtonpost/