The AI system named System uses 3D Motion Capture and Human Body Detection technology to build an innovative platform which overcomes current challenges through the utilization of advanced AI systems as well as deep learning and sensor technology. The system design involves merging RGB cameras with depth sensors and Inertial Measurement Units (IMUs) through AI algorithms for the purpose of real-time pose estimation and 3D reconstruction and temporal smoothing. The solution will deliver high accuracy alongside adaptable performance in different settings at low cost and user-friendly implementation. This project seeks to revolutionize motion capture technology by integrating real-time processing with multi-subject tracking and cross-platform compatibility. The system will generate a solution that serves diverse applications which include sports performance analytics and healthcare rehabilitation and virtual reality experiences and gaming and film character animation. The solution provides universal access through its motion capture system for people across diverse sectors who require efficient motion capture technology.