This feature is exclusive to ADMINS and PATRONS
In order to record a demo, open the Admin or Patron menu --> select: "TV Recode Mode"
This will activate the recording for duration of the next 2 maps. Remember, if a map is RTV'd, that map also counts as a recorded map.
🎞️ Viewing a demo
Place the demo in your game folder. In windows it would be:
"C:\Program Files (x86)\Steam\steamapps\common\Half-Life 2 Deathmatch\hl2mp"
Open the game and press: SHIFT + F2, from there you can load the demo and play it.