High Resolution Video Over Asterisk

Hi, I’m searching if Asterisk can support High Resolution (800x600 and higher) video and if there is any limitation for that, Could you guys give me some help.
The solution I need to run: we want to display video from a person (using video phone or softphone) in a Reception area using a Computer with the LCD monitor plug in the wall, so all people in reception area can see the video from other person and talk with this person, so the video image must be large otherwise people will not be able to see with whom they are talking.

I already know that it supports H.264, H.263 and H.263+, but cannot convert from one to another. And Bria softphone from Counterpath supports up to 640x480.