I’ve long been interested in something like this for my folks living on some acreage out in the country. They’d like to know when vehicles show up at their place and perhaps see who’s coming during the ~30 seconds it takes to enter the gate and drive up to the house. With a standalone workshop building strategically situated in a crook in the driveway, there’s a good point to set all this up.
I’m skeptical about any sort of IP video system being capable of reliably delivering a response time that’s as fast as all the advertising would have us believe. Throw in app spoolup on the phone, stream setup, and the design decision most make to absolutely mandate connectivity through their servers Because Reasons™ and yeah, it’s never going to fire up as fast as you can tab to that notification. On a local network, it seems like one could get reasonably snappy response with reasonable P2P comms to the point that one could use it like an intercom; remotely I’d expect some lag to the point that it’s more like a fast notification that something’s happening.
Some of my experience with this is via Foscam, who offered both a dangerously obsolete browser plugin (obsolete to the point that only Firefox tolerated it and those extensions went EOL sometime this year) and a laggy cloud solution. I’ve since removed that device from my residence - pretty sure that someone in Shenzen has plenty of motion-triggered footage of me walking down the stairs in various states of undress for laundry in addition to feline shenanigans.