The developer working on integrating network display functionality into GNOME Shell shared short video clip to the GNOME sub-reddit […] the feature adds a “screencast” button to the row of actions in the Quick Settings menu. Clicking this opens a modal picker where the user can select any Miracast or Chromecast compatible displays on the network.
Btw, is there any casting device/service available that’s not spyware (i.e. AppleTV/Chromecast)?
Miracast is basically just wireless HDMI
If you’re just going to stream video like this you could use any linux hdmi/wifi capable device connected to your TV. If you want to up that with popular streaming services you throw in a remote controlled browser on the device… which is what I believe a chromecast does under the hood.