I just saw this on ebay. I doubt it can frame sync for video, but it is neat how it can sync the lenses.
Pro USB Focus 3D USB Follow Focus for DSLR Canon EOS 5D Mark II 60D 7D 600D T3i | eBay (http://www.ebay.com/itm/Pro-USB-Focus-3D-USB-Follow-Focus-For-DSLR-Canon-EOS-5D-Mark-II-60D-7D-600D-T3i-/180945587183?pt=LH_DefaultDomain_0&hash=item2a21328bef&_uhb=1)

I could not see the content on the site above. So I've found another one:
Pro 3D USB Follow Focus Handle for Canon EOS 5D3 1dx Nikon D800 D600 D700 D3S | eBay (http://www.ebay.com/itm/Pro-3D-USB-Follow-Focus-Handle-For-Canon-EOS-5D3-1DX-Nikon-D800-D600-D700-D3S-/251082740798?pt=LH_DefaultDomain_0&hash=item3a75b2943e)
The most funny is content in the box:

1 x 3D USB Follow Focus
...
...
1 x USB Cable

:-)
3D product and they include only one USB cable. They must be joking.