streaming video to cellular iPad

Cellular and WiFi are simply different types of network connection (network bearer).

Streaming to your iPad is exactly the same whether using Cellular Data or a WiFi connection. The primary difference is potential financial cost. Streaming typically uses a lot of data; Cellular network connections are often "capped" to limit determined by your Cellular plan, is "metered" and charged by the volume of data that you use, or is combination of the two. By contrast, WiFi is often unlimited.

what do you mean?

you download an app like Netflix or amazon prime on the iPad from app store and launch the said app and stream their media to the display of the ipad