Action happens depending on objects moving, webcam

Hi! I’m a newbie with Touchdesigner.

I’m planning to make a project with a webcam and audiences moving.
What I would like to achieve is setting up a camera on the ceiling in a white room and depending on where the audiences are it activates some sound.

Do you guys think I can work this well with touchdesigner? If so, could anyone share wisdom with me for knowing which part to dig?

Thank you very much in advance! <3