update generic ip cam docs for stream component (#8956)

source/_components/camera.generic.markdown

@@ -33,6 +33,10 @@ still_image_url:
   description: "The URL your camera serves the image on, e.g., http://192.168.1.21:2112/. Can be a [template](/topics/templating/)."
   required: true
   type: string
+stream_source:
+  description: "The URL your camera serves the live stream on, e.g., rtsp://192.168.1.21:554/."
+  required: false
+  type: string
 name:
   description: This parameter allows you to override the name of your camera.
   required: false
@@ -125,3 +129,15 @@ camera:
     still_image_url: http://example.org/your_image.png
     verify_ssl: false
 ```
+
+### {% linkable_title Live stream %}
+
+To access a camera that has both a snapshot and live stream URL, utilizing the [stream](/components/stream/) component.
+
+```yaml
+camera:
+  - platform: generic
+    name: Streaming Enabled
+    still_image_url: http://194.218.96.92/jpg/image.jpg
+    stream_source: rtsp://194.218.96.92:554
+```