The actual video format of this camera is "AVCHD 3D/Progressive" (AVCHD 2.0), the video stream format is H.264 MVC. As other programs like VLC, kdenlive loads, plays and edits this format without problems (backwards compatibility to AVCHD 1.0), but it handles only the left-eye view of the video due to lack of support for decoding H.264 MVC.
It is necessary to use separate tools to "split" the video stream in two, one for each view. These can be edited in kdenlive and rendered as i.e. anaglyph 3D or side-by-side.