detect local extrema in a jitter matrix

Hi all,
I would like to locate local extrema in a jitter flow to do some tracking stuff (with the depth picture from the kinect) ...
Has anyone heard of a simple way to do this ? cv.jit.extrema doesn't seem to be the solution because it detects lines and i would like to detect points.
I guess this would possible with jit.fft but my knowledge of spectra is too limited.
Another way to do this may be to use cv.jit.blobs but I'm missing something ... any advice ?
Thanks,
J