I demoed an auto-accompaniment system that time stretches the speed of a video according to the tempo of real-time music. 

First, measure the overall average tempo of the violin performance in real time. Then, send this measured tempo as an OSC message to the Max patch. In the Max patch, the video is played, and the video playback speed is time-stretched according to the received tempo.

I want to develop it further with my own research in the future. (I also designed poster and program for our demo performance!)

(Someday I will upload my demo video... ???)