do i need to put text into a picture to zoom into it as it does in websites ?

i have an app with a lot of information and i want to zoom into each section

i can zoom into a picture with an image view but i have a background pic in the scroller and do not want to go over this.

how come there is no information on doing this -it would seem that this shouldnt be that difficult since i can do this on every webpage i visit

help -cant figure this out-