Display the key bindings on the screen

[marc tfardy <tfardy@tfardoland.net>]

I plan a Emacs video tutorial. For better key chords visualisation I 
would like to display the pressed keys on the screen (in a window or in 
a small separate frame). This means: when I type some key combination 
that is bound to a Emacs lisp function - or this keys are a prefix - 
these keys are displayed on the screen and are further normally 
processed. Think of something like key visualisation in this video:
https://tutsplus.com/lesson/the-command-palette/
but not as a separate software, but a part of Emacs. This could could be 
an advantage for extension, e.g. displaying of the command name.

Is there any package that cover this functionality?


-- 
(or greets gruesse pozdro)
tfardy