I was looking for integrating cocoapods to my existing xcode projects.
I found these few post but they are based on issue instead my problem.
not able to acess installed pods framework
How to add cocoapods to existing workspace not project (this one is for work-space not project)
Making a CocoaPod from an existing Xcode project (this one is more on integrating swift with objective c project)
So I spending quality time i did for my project. I am sharing step by step integration in my answer post.
please feel free to suggest and improvement.
happy to learn and share