Paul Dirac's Christchurch Lectures on Quantum Mechanics (1975)
https://www.youtube.com/watch?v=vwYs8tTLZ24
https://www.youtube.com/watch?v=mTGenBL6Ujs
https://www.youtube.com/watch?v=QmBng7Y7mgk
https://www.youtube.com/watch?v=P174LmmQYy4

Richard Feynman's University of Auckland Lectures on QED (1979)
https://www.youtube.com/watch?v=eLQ2atfqk2c
https://www.youtube.com/watch?v=kMSgE62S6oo
https://www.youtube.com/watch?v=jNNXD7fuE5E
https://www.youtube.com/watch?v=UigjOJm6F9o

Leonard Susskind's Theoretical Minimum Lectures
https://theoreticalminimum.com/courses

Carl Bender's PIRSA Lectures on Mathematical Physics
http://pirsa.org/index.php?p=speaker&name=Carl_Bender