When working with the assettype video, by default it will be streamed from Digizuite DAM. Either througt Episerver og directly form Digizuite DAM. This can be cofigured see DFE 2.1.0 - 3 Setting up Episerver and look for the parameter redirectvideostream .
If you want to have a cdn provider infront of the video streams. One prerequisite it that the video assets in Digizuite DAM are published to a distination with no security.
To configure cdn for video steaming, Open the web-cong and look for the <digizuite element. The child element that we are looking for is this <cdn baseUrl="" destinationId="" />. You can read about the parametere at DFE 2.1.0 - 3 Setting up Episerver.
Please contact you contact person at Digizuite, they should be able to provide you with the destionationId. Please remember thet the destionationId should be a destination with no security.