VideoImpl now creates the backend pipeline (queue->videoconvert->...->appsink)
Separate subclasses build a different frontend of the pipeline depending on the
type of video stream (uri, webcam , shared memory) that attaches to the backend
pipeline.
- VideoUridecodeBin: front-end for video file / uri
- VideoV4l2SrcBin: front-end for webcam (at the moment only works with
/dev/video*files, tested only on Ubuntu 14.04)
- VideoShmSrcBin: front-end for Shared memory / socket (used to work, currently
has problems)
Code is still hacky, needs work.
