Preview of local video file
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Test that details of a local video file are displayed in the preview.

Setup:
Have some video files available in ~/Videos folder.

Actions:
1. Open the Dash and switch to the video lens.
2. Make sure some video files from ~/Videos folder are displayed.
3. Right click a video file.

Expected Result:
Video preview should be displayed. Verify the preview display a sample video frame (a picture) and contains
the following data: file name (as title), modification date and time (as subtitle)  and 'Format', 'Dimensions',
'Size' info; 'Dimensions' should include resolution and aspect ratio, e.g. '1280:720, 16:9'.


Preview of local video file - preview-player close
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Test that music-preview-player is closed automatically when not needed.

Setup:
Have some video files available in ~/Videos folder.

Actions:
1. Open the Dash and switch to the video lens.
2. Make sure some video files from ~/Videos folder are displayed.
3. Right click a video file.
4. Close the preview.

Expected Result:
Video preview should be displayed. After closing the preview, verify with 'ps aux' that music-preview-player
process disappears after approximately 1 minute.
