Can you go into the Configure camera dialog from and show what's in there?
Some possible causes:
- The camera is sending a stream format that Kinovea doesn't support. Try changing the stream format from the Configure dialog.
- The exposure duration is too low, everything is so dark it appears black. Increase exposure.
- The camera doesn't have enough electrical current available through the USB port.
- The camera doesn't have enough data bandwidth available through the USB port.
For the last two, especially if you are on a laptop, try changing USB ports or using a powered Hub. Especially if you have other devices connected on the same USB root (it's hard to know which ports go to the same root USB controller but try disconnecting other devices to see if it makes a difference). Also try a smaller resolution from the configuration dialog.