"Computer Vision (CV), or image understanding, seeks to replace human interpretation with computer-based interpretation. Computer Vision deals with the automatic analysis, reconstruction, and recognition of objects in a scene from one or more images. Basically a video surveillance system deals with detection of unusual motion. The efficiency of video surveillance system depends on detection of moving foreground objects with lowest false alarm rates. This paper proposes a simple method to detect foreground in a video. The proposed approach of foreground detection employs computations in YCbCr color space for detecting moving objects in CCTVs."