Cookie Consent SPO site using iFrame (DSGVO - GDPR)

Hello,

I am currently building a Sharepoint site for our company (no external access possible, only visible for direct employees). I implemented the already existing webpart for twitter and used the "embed"-webpart with an iframe to our instagram feed (via powr.io). 

I assume that cookies are being used to display the twitter/instagram feed and according to DSGVO (German GDPR) users first have to consent. 

Maybe I am completly wrong with my assumption but if I want to obey to the law, how do I do that? Is there any possibility to implement a cookie banner for a sharepoint site?

Thanks for your help,

Pascal