This is from a scene in the movie クリーピー 偽りの隣人. In the scene, the wife has made a nice meal and it is laid out on the table. The husband sees it and says 「お！すごい。こってるな。」and the subtitle translation is "Wow, you really went to town!".
Is this the verb 凝る？It seems it has the meaning of "to be devoted" or "to be absorbed" as well as the more common meaning of "to grow stiff". So I'm guessing it's his way of saying that she really devoted herself to making a great meal.
Can someone provide a few more examples of this usage of the verb 凝る? （if I am correct in assuming it is 凝る)