Steal this idea.
CCTV with built in semantic search and analytics.
You should be able to put daily/weekly report requests in it (e.g. how many customers walked in), and do ad-hoc search (e.g. show everyone who went without buying).
Read 91 replies on XCCTV with semantic search and analytics
Why it is a long-game pick
An installed camera base and on-site deployment create switching costs; analytics is a recurring SaaS layer.