[Deetman]

At a bare minimum for a 1 camera stream with no FMS overlay, you'll need an HDMI capture card/device with audio input. There are many to chose from. To include the FMS overlay, you'll need 2 video inputs and some software capable of chroma-key to take out the background color from the FMS overlay.

Depending on where your event's FMS is coming from, it'll either have a scan converter with a few different outputs, or it'll be a DVI-D output which you can convert to VGA or HDMI as needed. If it is a district's FMS, it will definitely have the DVI-D output for the audience screen.