Havel, the blonde woman with her back to the camera, is sitting before a bank of screens, each linked to a different camera. It's her job to call out which image goes out to viewers at any given time.
In her explanation of the video, she wrote, "A lot of people have asked what it means to be the Associate Director on a show like Grease: Live. Here's a peek behind the curtain. Every shot in the show was scripted by our director Alex Rudzinski. My job was to execute that plan. You hear me calling shot numbers and camera moves carefully coordinated with the music."
Watch her here: