A simple matlab script to generate a sequence of images:

str=CARPETListDatasetHDF5('data','rho',0)
h=figure('Position',[100 100 800 600])
for i=1:100
data=CARPETLoadDatasetHDF5(str,i)
figure(h)
CARPETcontourfZ(data,0)
namefile=['imageXY' num2str(100+i)]
print(h,'-dpng',namefile)
end

For the movies, if you have mplayer installed with the necessary codecs,
go in a shell and use something like:
mencoder "mf://imageXY*.png" -o movie.avi -ovc lavc -lavcopts vcodec=msmpeg4v2 -mf fps=1
% the fps are the frames per second

Enjoy your movie:
mplayer movie.avi

Useful commands: 
(look at the documentation)
light,view,quiver.