Teh German Federation of the Blind and Partially Sighted (DBSV) provides a 5 minutes braille video in different languages: on youtube:
EN https://www.youtube.com/watch?v=jA2jS_lcupg&t=11s
FR https://www.youtube.com/watch?v=E40dDfGezZE&t=105s
SK https://www.youtube.com/watch?v=MI6rTn91Yys
DE https://www.youtube.com/watch?v=fU0vmOUlswM