You want to see IIT Lecture video on youtube so its video available on Youtube and may other site. Right now I have following video which I can provide you:

Metallurgy and Material Science
Environmental Science
Automobile
Management
Mechanical Engineering
Textile Engineering
Basic courses(Sem 1 and 2)
Civil Engineering
Physics
Mining Engineering
Ocean Engineering
Aerospace Engineering
Chemistry and
Chemical Engineering
Electrical Engineering
Biotechnology
Humanities and Social Sciences
Computer Science and Engineering
Electronics & Communication Engineering Engineering Design
Mathematics
Nanotechnology
Atmospheric Science
General

Let me know that from above which lecture video you want so that I can provide you the same.