Hi there @ollo, thanks for your question, it is a good one
We do not have Google Hangout or Video Chat capabilities built as standard widgets in our Widget library ((YET)), but the good thing is, you can still use Google’s Hangout developer API to accomplish this in your Webflow site.
Here is a very comprehensive documentation page from Google, which shows the scripts and markup your page would need in order to accomplish this:
https://developers.google.com/+/hangouts/button
Now, as you will see on that page, there is lots of ways to actually code this kind of thing, but for simple usage, I would do the following (and bear in mind, this have to be also tested once you get the code setup):
Step 1: Add the Google Hangout plaftform javascript link and rendering script to your Before Body panel of the Custom Code section in Site Settings:
<script type="text/javascript" src="https://apis.google.com/js/platform.js"></script>
<script>
gapi.hangout.render('placeholder-div', { 'render': 'createhangout' });
</script>
Step 2: Next, you will want to place a DIV where you want your Google Hangout button to be shown on your page, and give that DIV a unique ID of “placeholder-div”:
<div id="placeholder-div"></div>
Save and re-publish your page. Now your Google Hangout button will appear where you have placed that DIV.
Some more advanced settings from the Google Hangout developers guide, allow you to create a list of Hangout invitees and starts a Google Hangout App session when you click the Google Hangout button. You can view that documentation yourself on the Google Hangout page above.
If you need help from a coder, you might check our Freelancer section here on the forum, or you might take a swing at doing this yourself. In any case, you can always feel free to ask questions, here on the forum. I hope that gives you a direction to look into regarding Google Hangouts. Thanks for using Webflow ! Cheers.