I know that have some opencv algorthms ( here and here, for example) that handles effectiveness with stationary background subtraction. But i need do this in a non-stationary background. Thus using Hand-held camera. I would appreciate if someone could give some tips.
Segmentation of a dynamic scene is a topic of ongoing research in CV... However, for a quick win, you might want to try this rather nice library. It builds beyond OpenCV and provides 37 different algorithms for you to try - perhaps one might work well for your use-case. Good luck!