The Witcher is a multimedia franchise of books, video games, television series, and movies based around the written works of Polish author Andrzej Sapkowski. - Witcher Wiki
I'm interested in trying out this universe.
However, I like to fully get the whole canon (which is what attracts me to complicated universes).
As such, I am somewhat deterred from Witcher by the worry that in order I would have to play the Witcher video games (which - as a non-gamer - irked me to no end about Star Wars EU. God bless Wookieepedia and its little frequently inaccurate heart).
As such:
Is there any meaningful material in "Witcher" canon that requires[1] playing games to learn and isn't also covered in books/movies/TV?
By that I mean, either universe rules, or specific important events that affect continuity or character story, etc....
[1] ...assuming I don't cheat and read that canon data off of linked Wiki :)