1. There are absolutely no known viruses that can affect iPhones, unless they are jailbroken.
2. The images you show are of a link to Youtube, and of the Youtube App being unable to load the video you were trying to get to from the link. I see no reason to believe any of what you show is in any way a virus or related to virus at all.
Why would you think that is a virus?
It's just an error message from Youtube.