Dr Audrey Cameron from the University of Edinburgh introduces the British Sign Language Glossary project. This deaf-led project collects and creates new technical terminology for STEM subjects to support deaf education in the UK.  The viewer can expand Audrey presenting or the slides. There is no voiceover but there are subtitles.
The Glossary project link is here:   http://www.ssc.education.ed.ac.uk/bsl/
Audrey's email is:  [email protected]
You can also follow her on Twitter:  @aud2526