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You don't need to use the command line.

If you set it as your default video player it will work as you expect.

If you don't want to set it as your default video player you can probably do something like "Right Click -> Open with..." and choose MPV.

There are graphical frontends like Celluloid.

https://celluloid-player.github.io/

mpv tries to be pretty minimalist (and does this well), you could try a frontend (Celluloid, Haruna, etc.). And for the commandline, when you install the mpv package, depending on the distro, the package creates a default shortcut/desktop file, so you can open videos on your WM without hitches, on the menu bar. You can associate the shortcut to mime/file types and set as default player too. You can create yourself a desktop file too if necessary on your profile (eg: $HOME/.local/share/applications/mpv.desktop) with this file/content [1]

[1]: https://github.com/mpv-player/mpv/blob/master/etc/mpv.deskto...