Can anyone show me where I can find information about how openCV is integrated in MRL?

I try to get openCV to run on Ubuntu 20.4. With manticore version when capturing a frame webgui freezes, no interaction is possible. With nixie, there is an error message "could not get valid frame".

Which version of the openCV libraries has to be  installed in the system? What python scripts for openCV come with the installation of MRL and where can I find them?

Thanks for any support

gule