You mentioned that one option to mix graphics with the live video was to use an IPAD. Could you expand on that and detail the hardware and software requirements to make that happen?
I have a couple of suggestions for you to consider.
I would recommend some way of disconnecting power to the camera. If PTZ control stops working in the middle of a conference, you may have to reboot the camera to restore control. This would require a way to disconnect power from the camera.
In professional set ups, a CAT5 cable supplies power to the camera (using as many as all 8 conductors). It may be to your advantage to run an extra CAT5 for power instead of the expense of the contractor installing conduit and electric. CAT5 cables are now used for many types of signals including Ethernet, RS-232 serial, RS-422 VISCA, composite video, S-Video, HD Video (component, RGB, DVI and HDMI), power, etc. It does require adapters or baluns but these are cheaper than the parts/labor the contractor would charge for running conduit and installing an electrical outlet and allow you to disconnect power remotely.
Composite video signals are very complex and should not be split. Use a video distribution amplifier instead. If you meant to say "the video would go to the switch" instead of splitter, that would be OK.
You have several options for that one. You could use a 3-way video switch, and iPad (or laptop and scan converter). Create a PowerPoint presentation with the hymns and connect the iPad video adapter (or laptop's VGA out to the scan converter and video from the scan converter) to the video switch. Then just switch from any camera to the PowerPoint with the video switch.
Or you could invest in a video switcher. You could then connect all cameras and scan converter to the switcher and cleanly switch or dissolve between angles, superimpose hymn lyrics or names/callings over video. For example, if you were to invest $350 in a Videonics MX-1 video mixer and $50 in a VGA scan converter, you could get the following results:
Superimposed hymn lyrics...
Name and calling...
These shots were made possible with an investment of $400 and we got comments like "I thought we were watching general conference..."
BTW, is there any possibility that the Webcast Communicator software would be able to do this in the near future?