I use a Nikon D3200 with the kit lens and its worked out GREAT for me! Just NEEDS an external mic or external mic input.. but that is ANY DSLR (for video)
google my username (same there) to see some videos I've made explaining it (I'm a sound tecnician by trade).
Ergh, forgot DSLR if you are doing serious video blog stuff.
It's fine for shooting a month long doco if you have forever to muck around and need very shallow depth of field and specific shots etc.
But if you just want to shoot video without fuss, get a proper camcorder.
Disadvantages of DSLR's vs camcorders:
1) Many don't have full articulated (tilt/swivel screen), useless for in front of or top of camera work
2) Many don't have external mic inputs (useless)
3) Few if any have proper on-screen audio level meter
4) They are hopeless at maintaining auto-focus
5) Inconvenient with playback and general video operation.
6) Most can't take extended battery packs
7) Many can only shoot for limited periods of time (10-20min?)
Advanced features like peaking and zebra stripes
And there are others I'm sure I can't think of at the moment.
I would not trade my camcorder for even the best $10K DSLR, my video shooting productivity would instantly drop to zero, and the hassle factor would go through the roof.
Dave.