Returns the current state of a video.
In: triggers the building block.
Out: is activated when the process is completed.
ReturnValue: current state of the video, can be one of the following:
- eInvalid: video source is invalid, file could not be loaded or streamed.
- eLoading: video source is currently loading.
- eUnloading: video source is currently unloading.
- ePaused: video is paused.
- ePlaying: video is playing.
- eStopped: video is stopped.