I've got a paranoia: can I use images in my video?

Alien

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Hi, guys!
I'm sorry if I create too much new threads, but it is really important to understand youtube. I have a big experience in making money online, web development and others, I'm not noob )))
But, I'm making screencasts showing my visitors a lot of websites. Can I do that?
Just imagine, someone has a website, he posted his photo. I cannot use this foto at my site. I know that. But what if a make a screencast and show his website and this photo in my video?