The original video is from the 2012 Burnett Lecture located here. This is the very end of the 2nd vidoe right before the Q&A

http://learningcenter.unc.edu/ldadhd-services/burnett-seminars/dr-russell-barkley/

The playlist for the entire lecture and Q&A is located here
https://www.youtube.com/watch?v=NUQu-OPrzUc&list=PLzBixSjmbc8drDgzMj4GpPVLt7y3oiABo

This video is from the end of Part 2.

The powerpoint slides are located here
http://learningcenter.unc.edu/files/2013/01/ADHD-2-Theory-of-EF-and-SR-shortened-1-hour-version.pptx

Dr. Barkley has far more info on this subject and more lectures on his website located here
http://adhdlectures.com/