No video lecture is specifically needed for GATE. You have to know the basics of GATE subjects and video lectures for them can be found in the below links. Choose the one which you like the most. All of them are guaranteed to be good.
For recommended videos for each subject you can refer here
This work is licensed under the CC By-SA 3.0 , without all the cruft that would otherwise be put at the bottom of the page.
Sister Sites: GATE CSE Wiki, GATE CSE, Aptitude Overflow
GATECSE