OvrStream can plug in to Gameshow via NDI.
Make sure OvrStream is sending out an NDI signal by going to Output> NDI or by selecting NDI from the drop-down in the Live Monitor Window.
To add OvrStream, to your Gameshow broadcast, add a new Source, select Capture Device and then your PC's name from the list of devices.
A New source with the OvrStream NDI signal should appear. Hit play on a graphic in OvrStream to test your feed.
You are now ready to Broadcast!