@ZeeGee
Thanks for a look at what a screen looks like and from this (and by this I mean a very limited knowledge and assumption on the subject-) you would need to run some sort of background screen as outlined in Remi's video then use the pose and/or animation player to make the sims look as you want them to then after all that add the music? If so that is some serious creative work going on there as it must take a lot of time an effort to get to the end result which shows just how much talent and creativity you all have :)
The requests animation video is awesome I have been looking for some vampire animations for ages and I adore the TS2 animation of a child dancing on another sims feet I can sit and watch that over and over today directly in the game.
I laughed at the animation book video as I am sure many creators looking for animation poses must find it a very time consuming job.
Lastly that's an awesome video showing how backgrounds are added but I am quite sure it's not as easy as it was made to look-)
I signed into youtube and subscribed to all 3 creators so I don't forget so thanks for sharing all the videos and links much appreciated :)
I am beginning to wonder if the OP has been scared off with the look of how hard it is to do lol