Chats and video feeds are generally not recorded. Some sites offer the ability to record a video session, but normally they are not.
And most video chats are point to point nowadays and don't require much server power.
And live video streams are a stream that others connect to. It is a broadcast from the source and others connect directly to the source. The server just acts as sort of a directory that tells others where to connect. The only time the server would be used as a middle man for a video stream is in rare cases where a point to point connection cannot be established which would only occur behind certain types of firewalls. That would require additional server software that i will not be providing and would be up to the admin if they want to accept those kinds of connections and install the needed software to do it, and that would consume a lot of server bandwidth so i would not recommend it anyway.
Thanks, great plan!