(ui): add full path configuration for file video
Description
When selecting a file for video display, the SCamera services returns a Camera object with the file path as relative, with a internal preference video dir as origin.
This has been done because of full activity save. Indeed, the file path was saved, and, when mooved toward an other computer, the full path could not match, while the relative path could.
However, in some application which don't save activities, a fullpath for the video selected can simplify the usage latter, in particular the opening.
Proposal
Add an option in the configuration which allows to use set the full path in the Camera object. Turn it off for default