[TorqueDog]

There are basically two ways to handle this:
1. Use a major company like Nest or Ring with their cloud connectivity, provided that they support multi-factor authentication. You are still at the mercy of their own security, but you are protecting yourself against your account being compromised.
2. Use whatever cameras you want -- whatever brand you want really -- but restrict them and the NVR from accessing the internet at all, forcing them to be viewed from inside the network only. Then set up a VPN in your router's configuration, and use that when you want to view your cameras. Connect to the VPN on your mobile, load the app, and connect to the NVR. Most consumer routers now offer VPN functionality, or you can flash DD-WRT firmware or similar to open up that functionality on supported routers.

Blue Iris and Reolink's NVR apps support direct connections from the app without any sort of manufacturer-provided gateway service to facilitate the connection.