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Mac OS X apps under menu bar > Help have functionality to search trough app menu bar functions.
This is great feature if you want to locate action/function or to learn where particular function is located. Sometimes this way you may find something that you wasn't even aware that it exist.

I made 3 screenshots showing how this functionality works in real life.
I think that this feature would be nice addition to KDE.

So if I understand this correctly, this is basically a search box for the menu bar (and that Unity's HUD also provides this feature)? You should be able to get this functionality by changing System Settings -> Application Appearance -> Style -> Fine Tuning -> Menubar style to any of the options other than "In application" and enabling the Appmenu Action Launcher plugin in krunner.

It could be nice to integrate a search box into the (in-application, titlebar or top-screen) menubar.

Ok, this is a valid suggestion and probably quite a few users would use the feature.
I myself however see this in another light. To be this appears like trying to right fire with fire. That works sometimes, but it carries high risks, always brings along losses and sometimes even worsens a situation.

Let's take a look at why such a "search feature" appears to be required sometimes: because the menus are too crowded, too complex, too chaotic. This is the reasons you point out, why one is not able to pick an entry right away or why one might even not be aware of all available points. You suggest to fight that existing problem by adding even more entries and features to those already crowded menus.
I would suggest that on should work on the cause instead of the symptom. Menus must be easy. Easy to navigate, easy to get an overview about, easy to use. If they got bloated, they must be slimmed down. If they are chaotic (unclear categories), they must be ordered. If they hold entries with awkward handles, those must be fixed. The result is menus actually usable again and - no more need to add a search feature.

Wouldn't that make more sense?

This function is quite useful with GIMP, especially to find filters. I use it all the time when I'm on Ubuntu.

I'd also love it. One of the few features that I like about unity

I would like to refresh this topic.

I see more cases where apps support such feature e.g.. Sublime text, pycharm, rubymine (all jetbrains IDEs I used).
My point is that I don't use menu bar/toolbar often and I would like to get rid of it. Most of the time I use keyboard shortcuts for actions which I do mostly in particular app. There are cases when I need to find some feature/settings/whatever and I have to enable menu bar/toolbar displaying and look for particular thing.
The best example is sublime text which interface may be really simple. I think that many apps would benefit from such option to disable bloating ui parts and give more space for user to do with that app things for which it was created.

Edit. Another great example is krunner which is essentially showing whole idea. It's allowing us to access things accross the system. Here the idea is to allow accessing things in current app.

I would like to bump this feature request as gimp, inkscape and a lot of other applications have a ton of menu items, especially when they change dynamically such as plugins.

Yeah, this feature was available for a while in Plasma 4 (see my previous comment), but the application menu bar subsystem underwent a couple of iterations between then and now, so while now it is very simple to add or remove a panel for the application menus or add or remove a menu button to the titlebar, the Krunner plugin which allowed searching for application menu actions is no longer available.
Perhaps it should be more straight-forward now to re-create that Krunner search plugin (or add a search bar to the menu bar panel widget)?

Is there an update on how to do this? I found a krunner plugin for appmenu, https://store.kde.org/p/1487409 but it didn't work, and I'm not sure what it it's supposed to do really. This would be so helpful!