Hi there.
It's indeed possible, but only of the planets and moon. You can't take deep-space images using a non-tracking dobsonian, due to the simple fact that a deep-space image needs a long exposure. During that long exposure, the object has moved in the FOV because you don't have tracking!
But you can certainly take great pics of the moon just by pointing the camera into the eyepiece. Planets are a little more difficult, but certainly can be done.
There are adapters you can buy to mount the camera onto the eyepiece to make it all a bit easier.
To start, have a read of an article I wrote a couple of years ago:
Astrophotography with a Dob.
I hope that answers most of your questions, but please keep on asking them if you're unsure.
Welcome to IIS!