It's possible, but you'll never get the sort of results you can with a webcam.
It seems strange to people that a 640x480 $100 webcam can produce better results than a 3000+ pixel $1000 DSLR, but it's true. It all comes down to the method of capture.
If your DSLR could capture 3000+ pixels at 30fps with a shutter speed of 1/30s, then it may do a better job. But it can't.
The webcam freezes the seeing, and takes many frames in a short period of time. Software in post-processing (registax) does the rest.
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