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There is an open defect with this functionality in ver 0.9.2 - See bug tracker ID 2643. In version 0.9.2 it uses recordMyDesktop to do the capture. I believe this captures video from an installed Web Cam using Video4Linux2. If your device does not start playing the source device when you click the record button, you may have to start playback on your device manually and then click record.
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Kdenlive provides functionality for capturing video from external devices e.g., Firewire, FFmpeg, Screen Grab and Blackmagic. At least Firewire and webcam capture were removed in porting to KDE 5 due to lack of manpower.
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