1. A security video system for monitoring individuals at a Point Of Sale (“POS”) area, the security video system comprising: at least one security camera generating image data of the POS area, wherein the security camera is positioned outside the POS area; and a security video analytics system for analyzing the image data to determine whether the individuals are within the POS area by reference to one or more customer regions, which are areas overlaid on the image data, the individuals being analyzed relative to the customer regions, wherein the customer re ions are trapezoidal-shaped, and the customer regions correspond to vertically oriented planes in a three-dimensional space of scenes captured in the image data; and wherein the security video analytics system determines whether the individuals are within the POS area based on lowest visible areas of their bodies relative to bottom edges of the customer regions and based on highest visible areas of their bodies relative to top edges of the customer regions.