Kdenlive Руководство Видеозахват
Kdenlive provides functionality for capturing video from external devices - Firewire, FFmpeg, Screen Grab and Blackmagic.
You configure video capturing from here).(more on this
You define the location your captures will end up using here).(more on this
To execute a video capture select the Record Monitor and choose the capture device from the drop down in the bottom right.
This captures video from sources connected via a firewire (also known as - IEEE 1394 High Speed Serial Bus) card and cable.
I believe this captures video from an installed Web Cam using Video4Linux2.
This captures video of the PC screen using recordMyDesktop. There is an open defect with this functionality - See bug tracker ID 2643