Update

Thanks everyone for your input. In fact just last night, I got a fix from the wxWidgets mailing list.

The answer for anyone else who comes looking is:

The Linux webcam should be addressed as v4l2:///dev/video0. Make sure that's a letter l (lower case L, not upper case i and not a numeral l) in the v4l2.

Now I have beautiful streaming webcam!

Regards

Steve