Can we make Flutter apps for Samsung TV? If yes, from where to start, I mean is there any documentation available? If any demo flutter app for Samsung TV available on internet please share the link.
Officially, no.
There is no support for any of the TV-OSs or Watch OSs or any of those peripheral devices. It's iOS, Android, Desktop apps for various desktops and the web.
Whether there are any unsupported hacks that might work with specific version of Flutter and a specific version of Samsung TVs I don't know. Maybe.