Yes, Reactiv SUITE supports off-the-shelf video capture cards and USB video capture devices which convert HDMI\DP video inputs into a USB stream.
These devices can be configured for use using the SETTINGS -> Device Manager -> AV Settings menu.
Using this menu, you can create an A/V source by combining video and audio inputs together into one stream. This device can be used in PITCH, STAGE or SCRIBBLE as a presentation visual aid, just like any other document or video.