What does an observation essay look like and how should they be written when observing someone ?

I need to know because I have to do an observation essay paper on President Obama’s 2011 of the Union Address video.My professor said to observe what he’s doing,use content of being specific,not just stuff.What kind of statistics Obama have.Organization: how does he transition.What kind of language does he do like for example,does he lean foward,etc.

I kind of get the idea but I don’t want to write the paper then later my professor saying I don’t have it in the right form and I never done an observation essay before. I would just like to know if you know any example observation essays around on the internet,what it looks like(from introduction,body paragraphs,and conclusion), and how it is done when observing a person like President Bush and such like that.So I can totally understand what I am doing.