Chilipeppr offsets

Hi
I’ve been using chilipeppr running tinyg retrofitted to a Suregrave 2516 router, which I have found brilliant and easy to use. I’ve just purchased a endoscope usb camera to help with aligning the work pieces but not sure how to create the offset to the spindle, I also have a pen plotter attachment.
I see there is a web cam widget with offset feature but I’m using a windows 10 mini pc to run my setup which it doesn’t support.
I would appreciate any suggestions how to use the camera to mark the workpiece as it would much more accurate way.