The purpose of this work is improving the functionality and usability of a low cost commercial surveillance system. The original system provides simple motion detection and sends alert messages by means of FTP or email. The modified system adds a software layer to the original system for implementing desirable image processing features. Particularly, people detection functionality was implemented by means of OpenCV Oriented Gradient Histograms . Also the modified system adds the use of Telegram messaging service for sending alerts. We compare the performance of both original and modified system regarding the intruder detection. Also the usability of both proposed and original system was tested by means of System Usability Scale (SUS).Red de Universidades con Carreras en Informática