First of all, you can guess from your question to do square dance video, should be for the elders in the family to do or the elders need to be used to make their own video, then the basic requirements for the square dance video production software should be simple and easy to use, so here is recommended to give you the domestic easy to use and powerful video production software - acoustic video (/xiazai.html).
The picture above is a square dance video style made by Acoustic Video, there is a mask, background, lyrics, subtitles, light effects, some of the necessary elements of the square dance video.
The steps to make a square dance in Acoustic Video are as follows:
1) Insert the background on the video track
2) Insert the shot video into the overlay track, insert the light effects and other materials underneath it, and make it blend together by grayscale key or multiply it together,
3) Add the song and the subtitles
4) Export it or burn it to a CD