Fix/BOOK-257 video player
* fix(BOOK-257): Fixes to VideoPlayerButton and added stories
* fix(BOOK-257): Hiding mute button when the user has interacted with it
* fix(BOOK-257): Added support for poster image
* fix(BOOK-257): add crossOrigin attr to videoplayer
* fix(BOOK-257): comment
Approved-by: Anton Gunnarsson
