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Hello,
I faced a similar situation and here is how I found the camera position and rotations :
After solvePnP, we get the rotation and the translation for the object - we need to do the inverse to get the camera position and rotation.
CvInvoke.Rodrigues(rotationVector, rotationMatrix);
// transpose the rotation to get the camera rotation
rotationMatrix = rotationMatrix.Transpose();
Matrix4x4 R = new Matrix4x4();
copy the rotation matrix to R, and swap the 2nd and 3rd row to swap y and z. After that, rotate the matrix by 90 degrees. This will give you the rotation matrix for the camera. Convert the rotation matrix to a quaternion. and set that to the camera rotation.
As for position,
camera.transform.position = negativematrix * R * Tvec;
where negativematrix is a matrix with 1 on the diagonals.