Hello, first of all this is not an automatic response and I assure you that I have read the whole project description.
If you need a high quality result, the signs needs to be recreated from scratch and then re-do the animation according to your videos. This might be a pretty much time consuming job, depending on signs complexity, and also the price may vary from a sign to another.
Other method is to automatically convert the videos to gifs, but the results will be pretty poor.
So please please provide more details and I'll try to make a FREE SAMPLE before starting.
Thanks,
Sam