Nikon just published a firmware update for Nikon D7000 DSLR. The update claim able to reduce the number of hot pixels that happen when user records video or using liveview on dark objects.
Bright spots were sometimes noticeable with live view mode or movie recording of especially dark scenes or subjects. Occurrence of this issue has been reduced.
what is hot pixels ? see the video below :
Download the update (version 1.01 ) , available for Windows and Macintosh