I'll double check with the newest Pylon to see if that could be the issue. I had initially tested 0.8.27 with a Basler camera and knows at least one other person for whom it worked. So it might be context specific. (Version I currently have on my machine is 5.1.0.12681).
Can you double check that you have the Basler runtime in your Path variable?
During installation make sure the option pylon C .NET Runtime is checked, under pylon Runtime option group. You may have to use the "Custom" install profile to be able to select that option.
edit: I realized you are using Pylon 5.0.x. Kinovea has to be built against a specific version of Pylon as they change their API. So please install Pylon 5.1.x if possible, and see if it works with 0.8.27.