I have been invited for an interview for a job which I really really like. Now like any person with anxiety I am dreading the worst-case scenario and this is hampering my preparation for the interview.

I have a semi-professional relationship with both and I am afraid that my shyness or anxiety might be a problem especially because my video will be on. 

I am afraid that I won't be able to sell myself during the video call (I have done that on paper otherwise I wouldn't be called for the interview)...and will not be able to convince them that I am what they need.

Any tips or tricks to take it easy during the interview?

PS: The interviewers have asked me if there's anything they can do to make the interview a more comfortable experience. 