Sure it's possible. I had to do it when I wrote the following macro. It's a complicated macro, but you can get ideas from reading it. Or, if you indicate what you want to do with your area, I could possibly write some code for you.
In your example, you saved the coordinates of the "OCR rectangle" in a variable called "Result". At any time, either before or after your OCR action, you can change the contents of the Result variable. I use that approach extensively in my macro above.
What is it that you want to do to the "Result" variable? Maybe move it (the rectangle) to the right by ten pixels? Then you could simply increase the x value of Result by 10. The possibilities are endless, but you have to use arithmetic and KM actions to accomplish it. A simple example would be:
I'm a big fan of Apple's new OCR. It cuts down errors by more than 90%, and is about 6 times faster (depends on which CPU you use.) It can read things that the old OCR cannot possibly read, like hand printed text. Sometimes even handwritten text.