I seriously hope that English is not your first language.
After reading that all I can guess is that you are talking about a person being 'AFK' during an STF.
'Camping' refers to a person waiting for something to spawn, and does not realy apply to STF's.
The closest thing I've seen to 'camping' is when someone decides to 'defend' the Kang in 'Cure' and instead of intercepting the incoming enemies, they sit 'on top' of the Kang and wait for the enemies to come into range. (Which IMO is a terrible tactic)