Here's an example, The Wanderer. I don't particularly notice how anyone breathes, but it's not uncommon for others to see it and complain. I think it's one of those things that once you notice it, you'll always notice it and it's distracting.
While looking for an example video of string players, I found this one. I'm much more distracted by the lack of shoes. I mean, I see their shoes right beside the two women. Put them on please. You're in a church and you're performing in front of people for goodness sake.