The Webcaster X1 from Epiphan works perfectly with our PTZOptics cameras.
The HDMI out of the camera goes connects to the Webcaster's HDMI input, and you get signal on the Webcaster.
You should plan on having an HDMI monitor to use with the Webcaster to preview the stream, as well as a keyboard and mouse to operate the Webcaster. Below is an example of the Webcaster, the screen on the left is the Webcaster itself, feeding the HDMI monitor from the HDMI output of the Webcaster.
The right screen is a live view from YouTube being streamed from the Webcaster.