Having a fix navigation bar transparent at the top, then black

First part, if your video doesn't have audio, choose the landing page "Cover". Put it in the unlinked section of your site, add a video and make it your home page. The video will play full screen with links to the rest of your site. This I think would be more effective than just a banner video. No reason you can't have both actually.  As far as having a fixed header look at this:

Thank you for the answer. But because I can't put a cover in an index, people wont be able to scroll down to the rest of the website. I don't want them to have to click to go anywhere, I prefer them to scroll.

To add additionnal informations : 

Looks like the navigation bar is like I want when I scroll down after the home page.

Meaning that the bar is transparent on the video, transparent on my first page (which is the home page, to which the header is attached), and then when I scroll down to the next page the bar becomes black with a bit of transparency.
So the goal would be to have this bar directly after the video on my first page.

anyone ? 🙂

Hi. Your site is private. Can you setup password & share url? We can help easier

password : helpme

http://jcbouden.com

Thank you 🙂

16 hours ago, jcbouden said:

password : helpme

http://jcbouden.com

 

Thank you 🙂

Do you use Personal Plan or higher?

Only Personal.

Try add this to Design > Custom CSS

div#showOnScrollWrapper.show ~ div header#header {
    background: black !important;
}

Hey there,

Thank you very much for your help.
For now the problem is the same, in the home page to which the header is attached there is no black background. Only when I scroll down to "Work". What I want is the black background to appear directly when the navigation bar is on the white background of the website.

Did I do something wrong ?