Moving 21:9 Video on 16:9 Screen downwards

Hi,

is there any option to move an 21:9 aspect ratio playback upward/downward on the screen?

so the current solution looks like this:

and what im trying to get is this;

background: my current setting is a beamer with a fixed 16:9 screen. the screen does not have any opportunity to mask part of it. i’d like to see 21:9 movies on the lowest part of the screen, because i dont want to look upwards too much. also i might try to cover the upper part with some black fabric.

thanks,
ManOki