In this paper, we present the combination of two well known techniques which are video synthesis and flocking behavior based on Boids algorithm. We introduce a new formulation of real-video based CG-animation. Our system can be used in the elaboration of games and special effects for movies. We have developed a system that makes possible to manipulate objects in the frames of a video while maintaining its natural appearance and complexity and allows us to multiply an object in the frame or control the pattern of its movement. The system accepts as input a video in format AVI and renders automatically another with new patterns from the original. Video Synthesis and Flocking Behavior are well known independent techniques but the combination of them was not researched yet. In this paper, we also present the speed-up and improving the quarity of movies. We finally got 10 times speed up.