If the video / movie files you want to view are in a format that is not supported by iPod Nano, you may be able to convert them into a compatible format with Video Converter Pro for Mac.

The iPod Nano is a portable media player designed and marketed by Apple Inc. It is the midrange model in Apple's iPod family. The first generation was introduced in 2005. It uses flash memory but with a 2-inch (diagonal) QVGA display and the "click wheel" found on the iPod Classic. The iPod Nano has gone through four models, or generations, since its introduction.

Instead of the hard disk which is used in the iPod Classic, iPod Nano uses flash memory. The first, second, third, and fourth generation iPod Nano include some pre-installed games: Brick, Music Quiz, Parachute, Maze (an accelerometer game), Vortex and Solitaire. The third/fourth generation iPod Nano include pre-installed games, but can also run games which Apple makes available for purchase in the iTunes Store.
Unlike the preceding iPod Mini, its battery is soldered to the printed circuit board of the device, making it harder to replace manually, although replacement batteries are readily available. The flash memory chips used are surface mount devices, making any attempt to upgrade the Nano's storage capacity impractical. It has up to 24 hours of power when fully charged.
The lack of the remote connector found on the top of many previous models means that a number of third-party accessories do not work with the iPod Nano; newer versions using the dock connector have been made. The first and third generation iPod Nano did not support voice recording; the second and fourth generation Nanos function with third-party recording attachments. It did not function with either Apple's iPod Camera Connector or other camera connectors from third-party manufacturers.
DVD to iPod Nano Converter for Mac is a powerful Mac DVD ripping software to get movies onto your iPod Nano. You may use DVD to iPod Nano Converter for Mac to rip encrypted movie DVDs with small file size and right resolution. The converted MP4 video can be used for playback on iPod Nano, iPod Classic, iPod Touch. Also, the video files can be used for video editing.

(PC user? Get Windows version here)