That is a VERY COLORFUL Convict you have there!!! The Desmoni is a good looker too!
How old is the video? How are the cichlid doing with the plants now?
Convicts are very cool cichlids! They are great parents, don't get too big, and are usually pretty passive for cichlids! I haven't had any in a long time, but I have seen a few good looking little convicts the last few times at the LFS, so I might have to setup a 40B with some!
As for the plant question, it just depends on the cichlid itself! I have seen some that wouldn't touch plants or dig for that matter, but others of the same breed will dig and rip apart any plants you have!
So I would say just try them out, making sure to match the water conditions to their liking, and see what happens! If they dig and rip up your plants then set them up a different tank, if not you got lucky, and just go with the flow!
Good Luck with them, and we sure would like to see some pics when you get a chance!