I know that this is kind of a cardinal sin, but I'm liking the tempo changes, added tremolos, and improvised additions in their performance. It's more...fun, like in a jazz session or sessions involving even more newer popular music.
I think this is the only performance of Passacaglia I saw RU-vid that the orchestra players are also mesmerized by the performance. You can see it in their eyes and they applauded just like the audience. @0:25 she is cute, by the way.