Can someone tell me what the tool is called, that is set on the workbench?
The image is from https://youtu.be/VK_ZozyqDYQ
The narration of the YouTube video you linked to specifies that it's a router he's using. At 1:32 he says "then with a router bit like this one I route the zigzag shape on two faces".
The bit alone is likely to cost cost upwards of $60 depending on the retailer.