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CinemaDrapehttp://www.hellogramming.com/cinemadrape/ is a tool I use on windows and it's a great app but there is no application that mirrors it's functionality on KDE. It focuses a rectangle of any size on a desired location on your desktop and blacks out the surrounding area. This should have Multi-monitor support so that if the user wanted to blackout the surrounding areas of an area on all monitors or just one monitor they could. please consider implementing this feature.

There is a desktop effect called Dim Inactive.

We can change strength to 100 to get the similar effect.

Only difference is that it is for Window and not for a screen area.

If there is a keyboard shortcut which can call this setting, or there is keyboard shortcut to increase / decrease strength, and extend the setting to select screen area, this functionality can be achieved.

So, to summarize the use case:
- hit the keyboard/mouse shortcut
- the cursor appears and you can define the box over the area
- you hit ENTER to confirm or ESC to cancel
- once the effect is on you have to push ESC to disable it

Simple, useful, interesting

+1

@Mamonetti a hotkey or mouse shortcut would be ideal

@chetankhona toggling between "window" & "screen area" creates a good balance for this effect.

This is the effect.

I'd go a bit further with this one.

I'd like to be able to black-out the whole web browser while watching the video in it, but not the rest of the screen. (I tend to code while watching something)

It does serve a purpose, for example if I wanted to show someone something on my desktop but i didn't want to expose other parts of my desktop or using the desktop in a public place and you'll have a software alternative to a privacy screen. I don't see how it could hamper the desktop in anyway.

Like the screenshot posted above. Some site have video players which disallow Fullscreen mode so it helps to obfuscate distractions.