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cvFindExtrinsicParameters2 use and translation vector meaning?

Hi, I have two questions.

First question.

I have marker. I get 2D coords of marker in pixels (image plane).
I can get rotation and translation matrix that looks like:

| r00  r01  r02   t0 |
| r10  r11  r12  t1 |
| r20  r21  r22  t2 |
|    0    0     0     1 |
Am I wrong or t0, t1 and t2 represents position of marker (x, y, z) in camera coordinate system?

Second question Can I use cvFindExtrinsicParameters2 to calculate 3D coords if I have 2D coords in pixels, intrinsic and extrinsic parameters? Or it is used only to calculate rotation matrix and translation vector?