The bar is probably too high up on your back, although I cannot say for sure from the video and your photos don't show up. There's nothing particularly injurious-looking about your squat. If you pointed your toes out a little more, your knees might be less likely to come in on the ascent, but that's about as much as I can say from a video shot directly from behind. I am afraid I don't know why your knee is bothering you.