Add video to tab variants documentation

 (#5626)

Co-authored-by: fern-api[bot] <115122769+fern-api[bot]@users.noreply.github.com>

Author: fern-api[bot]

fern/products/docs/pages/navigation/merge-tab-variants.mp4

@@ -182,6 +182,16 @@ navigation:
 
 Tab variants let you display different content variations within a single tab, and [support RBAC](/learn/docs/authentication/features/rbac). This is useful for showing different user types, implementation approaches, or experience levels without creating separate tabs.
 
+<Frame>
+  <video
+    autoPlay
+    muted
+    loop
+  >
+    <source src="merge-tab-variants.mp4" type="video/mp4" />
+  </video>
+</Frame>
+
 <Tip title="When to use variants vs. tabs">
   Use **variants** for different perspectives on the same content area (REST vs. GraphQL, beginner vs. advanced). Use **tabs** for completely different documentation sections (guides vs. API Reference).
 </Tip>