Do you need to transcode from NAS to TV?

New to the homelab.

Let’s say I have a NAS and I want someone to watch either a 1080p or 2160/UHD video from another house.

Can you have a method of just accessing the NAS and picking the video file and play it on the TV (of course the tv would support the video/audio codecs) without the need for transcoding? An analogy would be playing a video file from a usb drive hooked into the tv (I’m guessing there’s no transcoding in this situation).

I’m guessing an application would be needed on both sides (like jellifin?), but are there any programs that allow negotiation onto host, selecting video files and playing the video stream without transcoding?

If this doesn’t make sense I can try to clarify.

Thanks