My student asked me

One of my students asked what do I think about this violinist and if she’s playing with ‘live’ shound dancing like this and if its is possible to do all these unbelievable things in a first place.

Well, let me introduce you, Lindsay Stirling:

 

Honestly, my PERSONAL opinion is it is extremely hard to dance and play in the same time, especially dance in the way she does. One should choose if he/she is playing rather than dance or dance rather than playing.

So I think she is recording video track and sound track independently and believe me, when she records the sound, she is standing absolutely still.  :)))

Again, I can only guess and refer to my own experience.   :)))