Hello There,
Thanks for posting in.
We can achieve transparent navbar via Appearance > Customize > Integrity > Navbar Transparency. Then to implement the image background with Text and buttons, please use Revolution Slider. On your Page settings > Slider Settings: Below Masthead select the slider you have created under slider dropdown. Please also make sure that your Navigation is set to fixed top on Appearance > Customize > Header > NAvbar Position: Fixed Top
Hope this helps.