Also does better work detecting pixel format for video frames, depending on the
mode that camera is intended to be operated with.
Change-Id: I352204b8d6d1a9e7857d77b6363de2bb5d5db0dd
These two tasks (starting the camera device, and starting working thread that pulls frames
from the started camera device) should be clearly separated, and should not be combined in
one method (as it was with the 'startCapturing' method).
Change-Id: I779bee924d99d9a87257c6b76791545b76795e72
