The most common situation with video-conferencing, especially with a certain ubiquitous application, is to have each person behind a screen individually. Eventually, we may find two persons equidistant from a computer on one terminal, and that can work. Common use of video-conferencing software doesn't work well with three or more persons physically present at one terminal.
Hybrid physical and virtual gatherings must cover all four technical points in a broadcast capacity (as I have mentioned previous it the section on Simultaneous Communication Effectiveness). A virtual congregant ideally sees and hears through a panning camera with a directional stereo microphone. A virtual congregant is seen and heard though a speaker-equipped large tv screen, Any management screen should be independent of the wall of virtual participants. The video and audio output feeds (from the physical room to the internet) are usually separate, but visible to the computer.
All such use of these kinds of technologies usually requires practice. I will reflect on this in particular in the section on Learning Habits.
There can be a special situation with multiple virtual avatars is a single physical space. Audio feedback strictly prohibits any two terminals in a same meeting to be within even distant earshot of one another. It is possible, and even desirable, for two terminals to be present in a same physical space, but in different meetings, sub-meetings or break-out rooms.
Each terminal in a physical space would ideally be run by a pair: one person in the physical space and one person in the virtual space. They would also insure the three organizational imperatives of welcome, security and comfort. As I myself learn, my views may change.
We now have means by which participants can move into a separate sub-room with clergy, for example just like passing by the clergy on the way out of the service or maybe potentially in the sacrament of virtual communion.