Ty for the help, now i have tried to add the Tracker, which should be something like this
srcpad.link(sinkpad)
streammux.link(pgie)
pgie.link(tracker)
tracker.link(nvvidconv)
nvvidconv.link(nvosd)
nvosd.link(sink)
A new window is created trying to provide the output, but suddenly it close.
The console gives the Aborted (core dumped) error