yup... it's the last half of Beethoven Violin Concerto, movement 3 (finale).
What you are hearing at the clip's beginning is what's called a cadenza. It's a section where a planned stop in the music takes place. The soloist then plays the next section unaccompanied, as the music showcases virtuosic technique and expressive depth. Easily the most demanding part of the entire composition, players slave away for months just to "learn the dance" (memorize/internalize the gestures required to navigate its basic requirements). Then, to have the mind sewn into the muscle memory enough to make the cadenza your own, well that's mastery on a world-class level.
Did you notice that there was no music stand in front of him? The Beethoven is about 50 minutes long. Dude played every note from memory.
Side note: everytime he plays that cadenza (or any cadenza from any of the other 30 concerti he has memorized)... it's always different from the times before. He's no wind-up, pre-programmed animatronic in a tux. It's just amazing. This is the level of musicianship that sets the standard for the next generation(s).
The article you embedded was from around the time we first heard him. First rehearsal, I looked at my stand partner in crime and said, "Damn."
Final thought (I can hear everyone's sigh of relief): The Olympics are ongoing. Imagine the pressure that comes with the reputation as "one of the world's best." Now, imagine (consistently) performing at that level 60-70 times times per year.
We share this world with amazing people.
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