If start playing video from a grabbing device (MITK v2018.04-beta), nothing happens. I already checked the update loop / timer, which runs correctly. Maybe the background rendering doesn't work any more. This might be a hint that some classes providing this features (e.g. QmitkVideoBackground) are also not functional any more. Do we still need this example?
We can also add a simpler example, a open CV video can be visualized with a few lines of code. I would propose to add such a simple example or even replace the current one.