You only require a computer with with minimum ,
- 64-bit Windows 7+
- Intel® Core™ i7 +
- 64GB+ RAM
- 6900K +
- 4GB +Nvidia Graphic card ( however 4GB can support up 3-4 Camera Maximum)
- Possibly PLC ( Programable Logic Controller ) this is depends on your the Door/Gate/Bollard/whether if they manufacture does provide SDK ( Software Development Kit)