Demoscene Passivist wrote

Maybe u could take a look here: http://blog.pirelenito.org/2008/08/java-movie-playback-jogl-fobs4jmf/

Then download the MovieGL pack from his quite extensive code library (full sourcecode):  http://code.google.com/p/victamin/downloads/detail?name=movieGL_1_2.zip&can=2&q= 

There's an example class 'RGBGLTextureRenderer' wich does the movie->texture conversion. I can't really say anything about performance but I tried it nearly a year ago an it was quite fast at least for a single movie file.