A video like this cannot be used to diagnose a knee problem. Sorry.
I reached 127.5 kg x 5 x 3, right after that i got ill and did not train for around 2 weeks. I went back to 80 kg to start with, but after 3 workouts i had pain right above and on both sides above my right knee. It was hurting even when walking up /down the stairs. Squats did hurt even without the bar. I tried lighter weights, less sets, more rest but the pain just didn't go away. Finally it took 2 months for the pain to vanish (no squats).
My right leg has multiple (old) injuries in different muscles. I did also once hit my knee to a rock when jumping to snow (the rock was hidden by the snow). It was the worst pain i have ever experienced.
I have got back to 107.5 kg and I'm starting to have similar symptoms again ( not that bad yet ).
Is there anything visible on my video that could cause the pain?
2 heavy sets(107.5 kg) + 2 light sets (80 kg)
http://www.youtube.com/watch?v=-D_FY61JRNs
I will take more footage (from better angle) if needed.
A video like this cannot be used to diagnose a knee problem. Sorry.
It has to be from an angle where "sideways" movement of the knee is visible - right?
What would be your approach from here onward if you were me?
Get a better video. Watch the grip video again. Adjust your grip. Take some ibuprofen. Stop caring so much that it hurts a little.