There is no Skype API Control window if you use the Skype for Windows 10 App(Which downloaded from the Windows Store) or Desktop of Skype version 8.x.
If your Evaer could not show up in Skype API Control window(If your Skype version is 7.x). You may running Skype as Administrator or in Compatibility Mode.
You can also select the "Enabel stream acceletation mode" and "Capturing stream does not use the Skype API" option as the below image shows to have a try.
Tags: Evaer does not show up in Skype API Control window