How to connect a CV910/CV910W to a document camera/video conference device (doc. cam/VC)?

(1) Connect a laptop’s VGA/HDMI output to a doc. cam’s VGA/HDMI input.
(2) Then connect the doc. cam’s VGA/HDMI output to the CV910/CV910W’s VGA/HDMI input.
(3) Lastly, connect the CV910/CV910W’s VGA/HDMI output to a projector’s VGA/HDMI input to finish the connection.
Easily change between PC or camera projection by switching sources on the doc. cam/VC.

PS: VGA/HDMI output and input cannot be used interchangeably