[DLStreamer] Add gvaaudiotranscribe element documentation (#1547)

Signed-off-by: Michalowski, Dawid <[email protected]>

Author: dmichalo

libraries/dl-streamer/docs/source/elements/gvaaudiotranscribe.md

@@ -0,0 +1,60 @@
+# gvaaudiotranscribe
+
+Performs audio transcription using OpenVino GenAI Whisper model. for more details on the whisper ASR check out [OpenVino GenAI Documentation](https://docs.openvino.ai/2025/api/genai_api/_autosummary/openvino_genai.WhisperPipeline.html#openvino_genai.WhisperPipeline)
+
+
+```sh
+Element Flags:
+
+Pad Templates:
+  SINK template: 'sink'
+    Availability: Always
+    Capabilities:
+      audio/x-raw
+                 format: S16LE
+                   rate: 16000
+               channels: 1
+
+  SRC template: 'src'
+    Availability: Always
+    Capabilities:
+      audio/x-raw
+                 format: S16LE
+                   rate: 16000
+               channels: 1
+
+Element has no clocking capabilities.
+Element has no URI handling capabilities.
+
+Pads:
+  SINK: 'sink'
+    Pad Template: 'sink'
+  SRC: 'src'
+    Pad Template: 'src'
+
+Element Properties:
+
+  device              : Device to use for inference (CPU, GPU)
+                        flags: readable, writable
+                        String. Default: "CPU"
+
+  model               : Path to the model directory
+                        flags: readable, writable
+                        String. Default: null
+
+  model-type          : model_type value to use whisper for inference: 'whisper' (supported).
+                        flags: readable, writable
+                        String. Default: "whisper"
+
+  name                : The name of the object
+                        flags: readable, writable
+                        String. Default: "gvaaudiotranscribe0"
+
+  parent              : The parent of the object
+                        flags: readable, writable
+                        Object of type "GstObject"
+
+  qos                 : Handle Quality-of-Service events
+                        flags: readable, writable
+                        Boolean. Default: false
+```