We really need some help on this issue. 

We are currently working on a project where we want to detect a person walking by a web cam.The idea is that the output of the camera and the processed image will be displayed using a projector. The people will be projected in a binary image. The person being red and the background being black for example. Furthermore we are planning to change this silhouette of the person while they are moving. We have found that OpenCV will help us to achieve this by using face detection and replacing the detected area with an image and so forth. The problem now is that we have to do  a background subtraction in order to just get nothing else than the silhouette of the person and alter it. We have tried a lot but have not succeeded in adding background subtraction to our sketch. 

Basically we need to do a background subtraction using OpenCV. We know how to do it using only processing.

Any help, ideas and/or examples will really be appreciated.

cjuulv & co.