Is it a smart tv? If so, simply format the USB at the windows default, I think it's fat32 or NTFS, I can't remember
Bang a vid on to it, and start the integrated player. That should do it.
If it's not a smart tv, you need some sort of player to watch the movies. That can be by a DVD/player (if it has the functions) or an Android Box or equivalent that connected to your TV by HDMI or whatever.