Why did you remove that cam? You never said why. It should work just fine along side of the Dahua cams, especially if you use BI.but I removed the HIKVision PTZ camera. That's a real shame, since it is 30X and was to be my "good" camera.
Running BI on a laptop will burn that machine out in no time.
I decided to build my machine rather than buy a used one on online. But that is just me. It's a hobby for me. Spent way more than most I am sure, but I have full control.
As far as a PTZ used for zooming in to ID someone, @bigredfish has a set up like that and has posted good video of it working. I just can't put my fingers on a link. Maybe he can link something in an answer.