Use Blackmagic Decklink PC card with Zoom

This probably works for other Blackmagic devices but who knows. (Im using Blackmagic decline on a PC). Blackmagic were no help when I asked them how to get my DSLR and Blackmagic card to work with Zoom.

However there is a workaround, if you download the fantastic OpenBroadcaster Studio and then install the VirtualCam plugin then OBS sees Blackmagic and the Plugin makes it a virtual camera, ‘OBS-camera’ that shows up in Zoom and I guess other software can use it too.