docs: add authz video in expansion panel (#4979)

This adds a link to a relevant video to the authorization docs.

---------

Co-authored-by: Geoffroy Couprie <apollo@geoffroycouprie.com>

docs/source/configuration/authorization.mdx

@@ -61,6 +61,18 @@ Services may have their own access controls, but enforcing authorization _in the
   classDef padding padding-left:1em, padding-right:1em
   ```
 
+<Tip>
+
+To learn more about why authorization is ideal at the router layer, watch Andrew Carlson's talk at Austin API Summit 2024: [Centralize Data Access Control with GraphQL](https://www.youtube.com/watch?v=ETyAPY4bsYY).
+
+<ExpansionPanel title="Watch the video below">
+
+<YouTube youTubeId="ETyAPY4bsYY" />
+
+</ExpansionPanel>
+
+</Tip>
+
 ## How access control works
 
 The Apollo Router provides access controls via **authorization directives** that define access to specific fields and types across your supergraph: