Free camera movement in demos/replays

[AtomicLugia]

I'm not sure if this is already suggested here and if so, it's probably very old.

Now the idea;
It would be kinda cool to have free camera control ala spectator mode during a demo. You can already swap between players viewpoint, change the camera style (chasecam) and I heard that free camera movement in demos is already possible in PrBoom+. Is it possible that this feature will work in the GZDoom engine as well?

If not and if this is a duplicate then I'm sorry!