Microsoft covered “Skype Broadcast” at the 1-Dec-2016 #UKOffice365Club this showcased how easy it is to add multiple camera feeds/angles, graphic overlays including powerpoint and ‘captioning’ via a ‘Single USB’ connection on the host Skype broadcast device.
The mutiple HDMI feeds was provided by a Roland V-1HD HD Video Switcher and the HDMI to USB connector was a Magewell
This was the overal schematic
https://twitter.com/yragstem/status/804264114004656128
https://www.linkedin.com/hp/update/6210035412270874624