They are fundamentally tied into the US economy and are known to effectively share data and behaviour across industries. If you were plausibly competing with a Chinese company and working from home, the question on where the HikVision information goes is a curiousity.
How much does it matter where the hardware was made if it is using local storage? If you are worried about this sort of thing, there is no reason you need to provide routing for the devices outside of your local network (e.g. VLAN). Unlike any hardware relying on cloud services.
Yeah I have to agree with this. If you're savvy enough to setup your own close-looped surveillance system then you're savvy enough to check if the camera is pinging home to a China-based server. And if it is then just block all WAN connections from that IP.