Maybe I need to be fitted for an an aluminum foil hat, but I just can't move myself to buy Dahua or Hikvision, no matter how superlative they may be.
I'll post my thoughts on the whole "Chinese" camera situation. I've posted this before and I have simply cut and paste my response here, but it still applies.....
There are two things to consider with regard to Chinese cameras. The first is the "hacking" or security risk that these cameras pose. Do not let the fact that these cameras are produced in China scare you from using them. There are two levels of "hacking" threats IMHO. The first is to the general population like you and me. We primarily have to be worried about our devices "spying" on us (ie sending information back to unknown servers) and our devices being taken over for "bot armies". Both of these threats are effectively eliminated with a properly secure local network which does not allow these devices access to/from the internet. The truth is however that you should be isolating these devices from the internet and the rest of your network regardless of the manufacture's country of origin. The second level is stuff that governments and large corporations need to worry about. These are targeted and active attempts to break into networks. These are done on high value targets due to the time and cost, so it's not something the average person has to worry about. Yes the US Gov has barred Chinese cameras from being installed at their facilities and with good reason.
Large businesses, utility companies and governments need to be worried about much more than the average person. Don't under estimate the level of digital warfare that is being waged today. As an example, take the Iranian uranium centrifuges that were damaged a few years back using a virus even though the facility was on a "closed network" without internet access. That virus floated harmlessly around the world until it finally found itself on the right network with the right centrifuges installed on it when an employee connected their laptop (that had picked the virus up outside of the facility) to the facility's network. At that point the virus was able to damage the equipment in such a small way that it went unnoticed for quite a long time. While that attack had to work it's way onto the centrifuge network by spreading throughout the world first, a camera would be a perfect trojan horse to get nefarious things onto an isolated (ie no WAN connection) network. The Chinese wouldn't have to figure out how to penetrate a secure government facility to upload something nefarious because we would install it ourselves when we installed their camera. Of course that type of attack would be very focused and have a specific target. Unless some sort of equipment on your network was specifically targeted, any virus would just "float around" looking for it's intended target just like the Iranian centrifuge virus did. This type of attack by design is an offensive weapon rather than a "data collector" because without internet there is no way to pass data back. It could be an extremely effective weapon however and it's why the Federal Government has banned or is trying to ban Chinese cameras, network equipment, and even cellular equipment from being installed in their facilities.
That being said, these are issues that the general public doesn't need to worry about. There is nothing on our home networks that the Chinese are going to "target" with that type of sophisticated attack. That's why I am perfectly fine with running Dahua cameras at my house. Of course they are on their own isolated VLAN without internet access to prevent data collection and zombie bot use, but that should be done regardless of the manufacturer or country of manufacturing.
Second, you have to worry about "grey market" cameras and whether a camera you buy is really designed for the US market or if it is really a Chinese version using some hacked firmware with English directions. I would not buy Chinese cameras from just any vendor. I would certainly recommend you use a trusted vendor because there are plenty of people selling Chinese versions of cameras with a hacked "English" firmware on it. That is a receipt for disaster because the camera will likely brick the first time you try to update it.