third party cookies messages?

Im sorry if this is a stupid question,
But if i have this tracking installed will a visitor get a message about third party cookies or tracking, when they visit my site?
i know those messages can sometimes deter visits to sites
or may their firewalls block the site?

That only happens if they have strict security settings on. No browser does that by default. Anyone who would get a message like from their browser is probably used to it from almost every site they visit!