Yes, it will work. Keep in mind some things:
(1) For presentation-only meetings, the web portal setting has no effect: HDMI sharing is always automatically launched if the Zoom Room detects that a laptop is plugged into the HDMI capture box.
(2) If you set the Web option to require manually sharing, then HDMI sharing will not start if you are in a regular meeting and you plug in a Laptop HDMI cable. A regular meeting is also a meeting that started out as a presentation-only meeting, and was then upgraded to a regular meeting. The ZR-CSAPI command:
zCommand Call Sharing HDMI Start / zCommand Call Sharing HDMI Stop/Start
Will correctly start and stop HDMI sharing, if the meeting is a regular meeting.
(3) Make sure that you use a white-listed HDMI-to-USB capture box, to use the HDMI source for screen sharing. The white-listed boxes are listed here:
Be aware that Extron’s MediaPort 200 is not on the white-list.
-Scott