Мне нужна аннотация (текст, строка, стрелка) к существующим видеофайлам

I need annotation (text, line, arrow) on existing video files. for this we use canvas layer for front end and video player at back end. and I play both at same time and its works. (using .net WPF)

But now need to export into one video file (Original plus canvas annotation )!

I need to inject canvas into existing video files, and export into video file so that anyone can play in any player.

Hope I clear my problem. Thanks

 InkCanvas Class i tried so far? docs.microsoft.com/en-us/dotnet/api/… but i am unable to export into one video.
 
Am I in wrong way please suggest?