Improved video quaility or longer recording times are possible with a hacked firmware.
The two linked pages below will get you started-
Wiki (how to)- https://nikonhacker.com/wiki/Nikon_Patch
Patching Program (requires Silverlight not a virus)- http://simeonpilgrim.com/nikon-patch/nikon-patch.html
*Remember to download the proper firmware version from Nikon.
*It is possible to return your camera to stock by flashing the most current OEM firmware.
I selected to Remove Time Based Restrictions and the HQ 64mbps mode.
Here's a screenshot from Bitrate Viewer that shows D7000 footage peaking at 67mbps!
After the firmware update the following recording options are available. Please note all times are approximate.
720/24 NQ (5 mbps)- 59 minutes
720/24 HQ (8 mbps)- 42 minutes
720/30 HQ (10 mbps)- 39 minutes
1080/24 NQ (20 mbps)- 24 minutes
1080/24 HQ (64 mbps)- 8.5 minutes
Check back for 64mbps sample footage.