If you're going to do video conferencing, you need to think about one or more cameras. The Polycom RealPresence codecs (Group 310/500/700) are good choices for a hardware codec, especially if the client has to VTC with other Polycom endpoints. The Polycom codecs have their own cameras which can be mounted in different locations, depending on the model. These cameras have their own cables.

If the client wants to use a soft codec like Skype For Business, WebEx, etc., then you would use cameras from Vaddio, HuddleCam, etc. These cameras use Cat5e/Cat6 cable and would need to be accounted for.