Instructions on how to make animations in GeoGebra can be found in Bo Kristensens GeoGebra Book: kortlink.dk/n7x2
Example from Bo's book (Hastighed = speed)
For inspiration you can check out Nanna Filt Christensen's ideas for use of animations in class on her homepage: Nanna Filt Christensen Animation Homepage (in Danish) She asked her students to make some dance moves, videotape them and challenge each other to animate the moves in GeoGebra. One of the outcomes can be seen in the video below. The page also contains ideas on ghost-trails, where students use GeoGebra to make replica of patterns given by a video, and how data from running can be used in GeoGebra.