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no, unfortunately you cannot arbitrarily "zoom" into your image there.
the annotation tool has a scaling factor, but this is for the opposite case (making large images smaller)
however, as a crude hack, you could try to change the resizeFactor here from int to float, and recompile the app. this would allow you to use fractional scale factors, and call it like:
opencv_annotation -i=/data/testimages/ -a=/data/annotations.txt -m=1 -r=.25
(this would upscale your images by a factor of 1.0/0.25 = 4)