It's a model train layout in N scale or N gauge, presented by the members of a German model railroading club. The members are always building their model railroad as a modular system, also known as FREMO module layout. It's a fine model railway layout.
Actually, there are more than 250 videos about model railroading and railway modelling, for example, on Dailymotion and YouTube. Please, visit also Pilentum's Facebook site.