Redefining combination of (keys, mouse) for rotation of camera


My case:
I use an orthographic camera and geometries that lies in X, Y vector coordinates. I need to rotate camera by using combination of CTRL key + left mouse. Rotation should be similar to rotation of Controls provided by threejs but it should be done for 2D world only (supposed that view only from up to down and corresponding rotation for such a view).

Do you have any ideas how to do this?
Thanks in advance.