Learn about cursor size in the Effect Category settings when you click Tools-Options on the Ocam main menu.
The cursor size is set to 1 by default. (If you set 2, it will be doubled. If you set 3, it will be 3 times. The larger the cursor size set by the user is, the larger the mouse cursor is in the recorded video.
The actual mouse cursor is the same size and it only applies to the recorded video.
The following image is recorded when the cursor size is set to 5.