The setup wasn’t real or faux-real, it was very clearly professionally made and presented like a comedy sketch. Some office-worker starts lip-synching to a song facing her webcam, her co-worker joins in, and eventually a half-dozen people in the office are all dancing around. In the end, the boss shows up, and I can’t recall if he joins in or sets them all back to work.
It’s possibly European. The camera doesn’t move. It’s at least five years old. This recent Russian office dance-party skit reminded me of it.
Google mostly gives me clips of “The Office” and other irrrelevant lip-dubs or viral videos.