As Paderborn University uses its own video portal, other universities likewise have their own video portals or resort to commercial providers. Especially for introductory events, it can be easier to search for existing videos before considering own productions. In the following, you find some examples of universities that made their videos (partially) available to the public.
Video portal of Paderborn University
On the video portal of Paderborn University, you can find recordings that were produced within the university. Without login, all uncommitted videos are accessible. They can also be inbedded in PANDA, which then requests the login data for students and teachers. To upload video files, permission can be requested at the IMT: imt(at)upb(dot)de Video portal of the University of Paderborn (https://videos.uni-paderborn.de/)
Harvard University Videos
Harvard University uploads some of its lectures. They can be accessed via YouTube or iTunes U (iTunes requests the application for your accessing device).
YouTube-Channel (https://www.youtube.com/user/Harvard/videos) iTunes U Harvard University (https://www.harvard.edu/itunes)
The MIT uploads some of its events to YouTube. The videos are with subtitles. MITOpenCourseWare (https://www.youtube.com/user/MIT/videos?app=desktop)
The University College London uploads short clips and full lectures on Mediacentral UCL Mediacentral (https://mediacentral.ucl.ac.uk/)