Please check in other DirectShow compatible programs first.
- VLC (Media > Open capture device)
- OBS: https://obsproject.com/
Also check you don't have a software taking ownership of the camera. On my system I have a program called microSIP (VoIP) and it runs in the background and I can't get any DirectShow camera to work until I close it, even though I don't ever use it with cameras.
Also sometimes you have to go in Kinovea settings and change the resolution/framerate for it to initialize properly. And while you are in the settings make sure the exposure is not set too short a duration.
Do you see the rectangle of the image and it's pitch black, or you see the dark grey of the capture screen and there is no camera rectangle on it? Does the thumbnail snapshot work on Kinovea main screen?