It's not the same setup at all, but you can already find some answers out there on the internet, starting with the Sound On Sound article about the Justin Timberlake - Say Something video we were honored to be part of.
For this shot, there are about 6/7 lav mics (Maggie, the guitar, the piano, some of the fans who sang really well), a stereo boom mic and a bunch of stereo ambient mics hidden in the different areas of the path Maggie follows. I don't know if this is of any help for you? Afterwards, we mix it all in the studio.
The guitar is recorded with one of the lav mics hidden inside so it remains almost invisible. It has a much more natural sound than a pickup. You can see how we put it in the SoS/JT article too.?