The Gum Cam has video recording capability that allows you to shoot digital videos while keeping it concealed. The video can then be transferred to your desktop, uploaded online, or burned onto a cd/dvd.
Gumcam video resolution will depend on the specific type that you purchase. These resolutions will be 320 x 240 resolution or even higher (640*480, etc.). You will need to look for that when selecting. Higher resolution will give you better quality video.
You should be able to find some sample videos that have been shot using a gumcam on sites like youtube.