customize with button on screen while scanning Bar Code

I need to have button on the screen while scanning the barcode using the barcode plugin or any other plugin or

If possible to restrict camera to display in half screen

Hum...

I am not sure the existing plugin can do it...
If you can't, you probably will have to change it yourself, or try a different one, like the plugins recommended here: https://stackoverflow.com/questions/31128943/cordova-app-is-it-possible-to-show-camera-feed-in-a-container

You would have to create the OutSYstems interface yourself if there isn't anything already in the Forge.

Cheers.