A company could drop a camera and a small NAS box, and have it all work over the local WiFi.
I haven't looked into it, but I suspect there are several vendors who already do this.
It would get more complicated to support accessing it while away from home, admittedly. I don't know if that's an important feature for this application.
This is a huge feature which I've solved using an IPSec VPN. This is not something that's easy for regular people to do though, so it's not a universal solution.
If someone made a router that could easily provision VPN access for a device (e.g., generate a sensible OpenVPN config or something) it would make this setup a LOT easier.
That's the killer feature. What good is a home surveillance system if you have to be there to use it?
If you setup a company to do this, you will quickly find you are a customer service and call center company, NOT a security tech company.
Been there, done that.