One approach is to use two video capture cards.
One taking an hdmi feed from your Mac. This is essentially set up as an external monitor and is outputting via usb to an OTG cable going into the front of the Hypno. Having a capture card with hdmi thru to another monitor would be super helpful here.
On the way back having hdmi out from the Hypno going into the second capture card feeding back into OBS on the Mac.
Instead of the first capture card you could also try using a suitable webcam pointed at the Mac’s screen, traditional video synth feedback style, again attached to the Hypno via OTG.
With either of these situations you might run into issues with your Mac not having enough or the right type of ports.