You require a computer with minimum ,
- 64-bit Windows 7 or higher
- Intel® Core™ i7 – 6900 or higher
- 6th Generation or higher
- 64GB RAM or higher
- 6GB Nvidia Graphic or Higher
- HDD 500GB or higher
- Possibly PLC ( Programable Logic Controller ) this is depends on your the Barrier/Gate/bollards whether if they manufacture does provide SDK ( Software Development Kit)
the information above can operate up to 5 IP cameras . if you intended to connect more cameras you will require higher GPU and you may require higher RAM