Carrara already can use animated textures and backgrounds, no plugin needed!
just open an avi, mov or sequenced image files (eg jpg, it will put up an open using window where you can choose sequenced jpg by clicking little arrow)
in the texture room or scene backdrop
you will have a start/finish slider you can position along the timeline under the texture, you can in the timeline keyframe start at beginning, finish at end and then click on the tweener and choose oscillate to make it loop a chosen number of times.