Impact has the video as a background and the text in the middle as a foreground layer … that’s all part of Impact’s normal functionality, the 2nd page is also an Impact but as a slideshow.
The fixed logo in the top left is done with BigWhiteDucks’s Chroma, it essentially pins content to part of the browser window irrespective of the scrolling of the page.
The logo itself is an svg but it could just as easily be a png.
Here’s another example that makes use of Impact and Chroma https://www.dma-ni.com.
Impact is doing the slideshow, it has a semi transparent dark overlay to visually push the images back and then the DMA logo in its foreground.
The vertical side menu is kept in place when you scroll by Chroma.