I am totally taking a shot in the dark here as I know nothing about the ins and outs of Linux but I ran across this video editor: http://www.openshotvideo.com/.
I have had a short conversation with the developer who knows nothing about Maemo.
Now, I am not expecting much, but what got me thinking about this was the new commercial about the iPhone editing video.
well, there's a "raw power problem"... video editing requires a good processor and lots of memory... with 400mhz and 128 RAM i dunno if it is possible.
there's some chance of working if it was PORTED to maemo... easy debian requires some system resources... using it with the remaining power could be tough
I believe "editing video" on the iPhone is limited to splicing homogeneous streams, which isn't that big a workload; you only need to re-encode the few frames around the splice. Something equivalent should be no problem on the N8x0, but its usefulness seems limited.
Something like OpenShot looks much more useful, but almost certainly unusably slow on the tablets.