The instructions below assume that your working with the IDTRKVALID output stream. You need to add the following to your Reco.py command to have the IDTRKVALID stream output. See twiki for details

--outputDAOD_IDTRKVALIDFile="$2"

Dumping track seeds

Track seeds can be dumped by...

from InDetJobProperties import InDetFlags

InDetFlags.doStoreTrackSeeds=True

Dumping track candidates

Track candidates can be dumped by...

from InDetJobProperties import InDetFlags

InDetFlags.doStoreTrackCandidates=True