add video tutorial iframe link

Author: bryantanderson

fern/customization/custom-voices/tavus.mdx

@@ -15,3 +15,15 @@ To integrate your custom replica with [Tavus](https://platform.tavus.io/) using
 2. **Retrieve Your API Key:** Go to the [API Keys section](https://platform.tavus.io/api-keys) on Tavus to get your API key.
 3. **Enter Your API Key in VAPI:** Navigate to the [VAPI Provider Key section](https://dashboard.vapi.ai/keys) and input your Tavus API key under the Tavus section.
 4. **Enter Your Custom Replica ID:** After adding your API key, you can select Tavus as your assistant's voice provider and add your Custom Replica ID manually through the dashboard. Alternatively, you may use the API and specify the replica ID within the `voiceId` field.
+
+**Video Tutorial:**
+  <iframe
+    src="https://www.loom.com/embed/f3f8a6f3ec0d46c79874ee9e032ae332?sid=981ef281-a30b-46e3-ac19-1a2b2b176511"
+    title="Loom video player"
+    frameborder="0"
+    allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share"
+    referrerpolicy="strict-origin-when-cross-origin"
+    width="100%"
+    height="400px"
+    allowfullscreen
+  />