Hmm, I've never tried this before, to be honest.
But the capture card works as follows:
The signal is tapped via HDMI IN.
It is then looped to a monitor via Signal Out, so that you can still play on a console, for example. (I only use the HDMI IN on the PC, as I only want to tap the signal via OBS for transmission via Twitch).

So if the camera supports live output via HDMI (probably miniHDMI or something on the camera, then with a cable to normal HDMI as output), that should work.

Information but without guarantee :)