Add https://youtu.be/OpWpBI35A5Y to inference-api Docs (ultralytics#8717)

Author: RizwanMunawar

docs/en/hub/inference-api.md

@@ -10,6 +10,17 @@ The YOLO Inference API allows you to access the YOLOv8 object detection capabili
 
 ![Inference API Screenshot](https://github.com/ultralytics/ultralytics/assets/19519529/a8c00e55-1590-403b-bdee-ed456c60af4d) Screenshot of the Inference API section in the trained model Preview tab.
 
+<p align="center">
+  <br>
+  <iframe loading="lazy" width="720" height="405" src="https://www.youtube.com/embed/OpWpBI35A5Y"
+    title="YouTube video player" frameborder="0"
+    allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share"
+    allowfullscreen>
+  </iframe>
+  <br>
+  <strong>Watch:</strong> Ultralytics HUB Inference API Walkthrough
+</p>
+
 ## API URL
 
 The API URL is the address used to access the YOLO Inference API. In this case, the base URL is: