Just used NDI Virtual Input on Windows for a Zoom call. Crazy setup I've got here, but essentially it was grabbing video and audio from an OBS session on another machine over NDI that would normally be broadcasting the output to YouTube. Using it was a little funky. Had to right click the tray icon to select the NDI stream before I could utilise the virtual inputs. Would be far more usable if the studio monitor actually utilised/set the same inputs. Anyway that's an NDI thing not OBS. The OBS bits worked a treat.