My boys are rarely alone, but I used my computer to video them when I had to leave them. They laid in their beds by the door the whole time. Teddy sighed a lot like he was saying, "When is she coming back?"
When Max was a pup, I left him in my bedroom once for an hour. I found him running around with his piddle pad, having a great time.
If I worked outside my home, I would love to have a camera setup like you have.