Yes, I do this, but I'm not sure if it is helpful to know since I work from a home office by myself. I sometimes have 4-5 movies or videos playing, 2 music sources, maybe a ham radio or two, all at once. But the movies are usually all silent except for one, and the music and radio volume is very low until I hear something I am interested in. I've been doing this on and off since about 2006.

Most people I talk to about it have the idea that it must be very difficult to focus, but I don't find it difficult to focus at all, and usually it makes work more pleasant, making productivity more sustainable. Sometimes it also directly helps in my work...

One rule that works best for me is that most of what's on screen has to be stuff I've seen before, or am only a little bit interested in. What about you?