Capturing players screen

COD 4 iw4x. How is possible, thats a owner of the server can capture my screen (while i play on his server) and my overlays (the question about THIS), like nvidia freestyle or sweetfx, is it possible in normal way or this is sripts? I think thats illegal, is he can capture screen out of game logically? Nvidia freestyle doesnt injecting a process as i know, its more like overlay.
IP server - 195.2.81.134:28960
Скриншоты | Za30CoD - owner screenshots of players

You are talking about CoD4x, which is the Mod for Call of Duty 4.
You gotta ask them https://cod4x.ovh/

IW4x does not allow for this.