camerabin: Add one property to set video sink element for video recording pipeline

Submitted by kevin

Link to original bug (#744508)

Description

Camerabin use filesink for video recording sink. I want add one property to set sink element for video recording pipeline. So application can changed to multifilesink or udpsink. multifilesink can save recorded video to fragment video files. udpsink or other network sink can streaming captured video to other server.

The default sink of video pipeline can be set to filesink or fakesink?

What's your option? Do Gstreamer community accepted the patch?