Sagot :
It's a metaphor because you are comparing yourself (or whoever the sentence is talking about) to a camera lens that "zooms"
It could be a couple different ones... it really depends what "it" is. Like the answer above, it is a metaphor, because you are relating "it" to something that zooms (i.e. a cameral lens). It is also an onomatopoeia, because "zoom" is a sound. Hope this helps!!