Day 2: 1:00 A.M.-2:00 A.M. - S2-E18
Visible crew/equipment: In the gun battle just after Kate has shot the man there is a shot of Jack spinning and shooting in which you can see a cameraman filming the action to the right of the screen.
Day 2: 1:00 A.M.-2:00 A.M. - S2-E18
Visible crew/equipment: When Jack is escaping with Yusef and Kate, the shadow of the camera crane is visible on the car. (00:21:00)
Day 2: 7:00 A.M.-8:00 A.M. - S2-E24
Visible crew/equipment: When Jack and Sherry are running down the corridor, Jack is thrown against the wall. Look at the edge of the screen and you can see the camera that shot the last shot move.
Answer: According to Jack in season 5, Nina was "deep cover" before the pair ever met, so it's safe to assume she was recruited before she joined CTU. As for what her primary mission was, who knows? Perhaps it was to gather sensitive intel and pass it on to her superiors. Given that she worked for an intelligence agency, it's not a stretch. Or perhaps we may find out in season seven.
Cubs Fan ★