If Startseite for Home is too long, using Start is also ok.
Menü is the German term for Menu, also in "computer speak".
Product Video can either be Produktvideo or Produkt-Video. The hyphenated version is also ok, even though Produktvideo is a proper and understood compound noun.
Please note that in apps (Android, iOS, etc.) there may be other OS-specific ways of achieving what you want. Please make sure to stick with the OS's way to avoid confusion for the user.
Please note that the last paragraph is the result of the fact that I'm a software developer and I disagree with the current trend of calling every piece of software an "app".
To me, an app is a small piece of software specifically designed to run on a smartphone (=> Android App, iOS App, etc.). Everything else (web sites, desktop applications, server side services) are not apps and should not be called "apps"! Even though "app" is just an abbreviation of "application" I do consider them very different things from a software design point of view.