How to sample near optimal solutions?

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I have a function $f(x)$ that is strongly convex and the minimum of $f(x)$ is obtained at point $x^*$. I want to sample some $x\in \{x: ||x-x^*||<c \ {and} \ ||f(x)-f(x^*)||<d \}$. Is there a rigorous way to uniformly sample some $x$?