They're fine. They wouldn't last a couple days without mom feeding them. I have a nest in my rose bush and I probably scare the mother away dozens of times a day. After the chicks hatch she spends most of her time getting food for them.
Feeding Time

Cphil please read this handout from Project Wildlife. They deal with a lot of hummingbirds every year including "orphan" babies that should have been left alone. The most important part is on the second page.

Here is a link that might be useful: Project Wildlife Hummer Hints

Dellwo, nice video, but that looked like it hurt!