Is there a Magnifier app for Ubuntu? I want to use a bounding box with the mouse on a part of the screen and magnify it for our eyes to Zoom

Please see the following related answer:

Default screen magnifier?

The accessibility settings in 14.04 appear to have been changed to only include "enhanced zoom desktop", but you may find this a suitable alternative to a magnifier.

After installing compizconfig-settings-manager per the linked answer, you will want to configure the enhanced desktop zoom such that you have a zoom in and zoom out key, at a minimum. From there, you can zoom as needed. The zoom follows your mouse as well, making it somewhat similar to a magnifier.

You can try KMag.

Just open Ubuntu Software Center, search for KMag and click install.