How is the video support in VTScada, can't find any good info in neither Developers Guide or Programmers guide.

I am using EmbedWebpage.SRC https://pastebin.com/4Pcvebxu

As example, Youtube works OK, but with a lot of lag. The video format that VTScada is able to show, is WebM - I have not been able to play any other formats.

What I'd really like to do, is to implement a browser (Chrome), or any program really - in a boxed window in VTScada. Is this possible?

I don't know if you can embed a browser in a VTScada window; however, you can launch a browser (or any other program) from a VTScada application in a separate window using the "Program Spawn" button, found under Widgets > Tools > Standard Library.