Metabones makes some pretty awesome adapters converting from Canon/Nikon to many competing standards including m4/3. Some of them even retain basic electronic functionality, like autofocus. Their fanciest and fullest-featured adapters focus on Canon, though, and the Nikon->m4/3 lineup is pretty basic. For example, they offer a Canon EF->m4/3 adapter Cine speedbooster, which would be perfect for you if they had developed one for Nikon (they didn't). http://www.metabones.com/products/details/MB_SPEF-m43-BT5
Regardless, nothing will be as full-featured as the m4/3 native lens lineup (i.e.: Panasonic's own line of awesome lenses). You might find it satisfying to re-use your nikon lens lineup, but eventually, if you are like me, you will realize that the concessions kind of diminish the value of the system...I just maintain two separate complete systems...a DSLR system, and a mirrorless system. I have adapted my DSLR lenses to my Oly OM-D, because I really really enjoy the spectacular images I get from my f/1.4 prime, or my constant f/2 zooms. But it's not really a stretch to me to adapt my dslr lenses, because I lose no functionality in doing so...they're all Olympus lenses, and completely compatible, once adapted. Going from Nikon-> m4/3 would require a decent amount of compromise, like my adapted canon tilt-shift lense, or my adapted classic SLR lenses.