http://www.houstonsecuritysolutions.com/resources/learning-center/security-camera-technology/10-not-so-obvious-benefits-of-ptz-cctv-cameras - PTZ CCTV Houston cameras can be sent to tour areas specified to track movements of suspicious people. Optional video analytics devices can be installed with these Houston CCTV cameras. The CCTV cameras Houston offers have multiple alarm inputs, such as motion detectors and door contacts.