After talking to the current maintainer of InsightToolkit, Mario Ceresa, he suggested to request co-maintainership for the InsightToolkit package.
Thanks Sebastian for creating the ticket. I was actually sending an email to fedora-devel but probably this is a better place.
Sebastian kindly offered to help me maintaining [https://apps.fedoraproject.org/packages/InsightToolkit InsightToolkit] and has already sent me some corrections to the spec file. I would like to give him commit acces so he can work on the package independently of me.
I'm willing to mentor him and help him with the guidelines as per https://fedoraproject.org/wiki/How_to_get_sponsored_into_the_packager_group#Become_a_co-maintainer
but I'm not a sponsor myself, so I need someone else to add him to the packager group.
Thanks and regards,
Mario Ceresa
Peter, has just sponsored Sebastian. I'll close the ticket as fixed.