Computer Vision is an excellent technology to extend the barriers of traditional interface devices such as mouse and keyboard. The technology helps media designers to design more flexible and friendly interfaces and create more interesting interactive content. This research extracts the features of designing better interaction and applies the features to a series of interactive systems and art works. The research results have advantages of easy development, low cost and using easily-available peripherals. Our systems and art works is an attempt to integrate multimedia and physical interaction of user movement and gesture. The results are satisfying and can be a reference to those who intend to develop future computer-vision-based interation.