display caption on Featured image in Post

Hello, Thanks for the great scheme. I’ve been working with it for a few weeks and my website turning quite nicely. Thanks for the good work.
Now, I would like to display the Caption in the Posts with the featured image.
I’ve seen a few plug-in / code snippet, but I’m not sure what’d be the best solution to do that, with as little impact on the based theme as possible.
Would you have a suggestion?