[PyQt] Changes on a widget recorded as a movie?

["V. Armando Solé"]

Hello,

I am recording changes on a QGLWidget grabbing the widget as png files. 
My goal is to produce a sort of  easy-to-embed animation for using it in 
impress and/or powerpoint.

Is there a way to achieve that from within python and Qt and therefore 
not having to use external programs?

Thanks for your time,

Armando