Reposition the camera's center relative to screen?

I have designed a ui and left a region for the actual game to draw (mobile game).
The problem is its not at the center of the screen so all the objects are parallax shifted because my camera s forward vector projects from the center of the screen instead of the center of the playable region.

Is there a way to set; in screen coordinates; where my camera center should be?

Edit:if there was a way to manually set the ratio of the black region when the aspect ratio is different than the screen this would also help. So the 2 black bars would have different sizes.