The GH3 is technically a "micro four thirds" camera, with a form factor similar to a DSLR. Although it can take very good still pictures, it's also built as a serious video device.
Micro four thirds (and DSLR's) will have a large image sensor, giving you a more of a "film" look, the ability to get depth of field/blurred background shots and low light ability. Plus you will be able to change lenses (a camcorder typically can't/although there are exceptions).
Camcorders have much smaller image sensors and comparatively are not suited for film-making. Camcorders are good for filming events, sports, etc.
I mean, you can shooot films with a camcorder for YouTube as "good enough" if on a budget /just starting out... but if for any serious and you have the money, then a micro four thirds or DSLR is the way to go.
This was shot with a Panasonic GH3: