If you're asking if Zennoposter alone is able to recognize captcha...then the answer is No. It cannot do that alone.
You have to buy CapMonster for this purpose or you have to use a captcha recognition service (Zenno is able to use the api's of multiple services like: antigate, deatchbycaptcha etc...check here: Settings>CAPTCHA )
You also have the "Enter Captcha Manually" button in Project Maker if you want to do that manually. Not so sure about this but I think you can set "monkey.dll" in the captcha recognition module in your template, and captchas should appear in a window where you can resolve them while the template is running in Zennoposter...but I am not very sure about this, because I've never used this feature.
There is no free way of solving captchas automatically, unfortunately.