Disklavier

I am wondering if dvds containing the pianosoft track (with the audio and video as normally found on dvds) do exist... It seeme that it could be a great tool for learning combining lessons with the video and the exercises shown ... maybe Im ahead but one could even have interactive lessons : please play the folowing... you played this too slowly please play again... etc. I know interactive lessons are possible using the internet connection and web cam but with pre recorder learning dvds for example ?