Ya know, those pesky vx2100 can be a bit balky about analog capture, but they WILL do it. Frankly, I generally use my Panny C7 for that, because it doesn't complain as much.
If I remember correctly (and I don't remember breakfast, so take this with a grain of salt) there is a menu setting where you decide whether the RCA jacks will be inputs or outputs. So step one is get that set correctly. Step two is connect the cables and get your vcr playing. Step three is bang on your vx2100 until you get the video coming across your LCD. X-D