snippets: stm32: addition of video-stm32-venc

Addition of a snippet in order to enable and configure the
STM32 VENC encoder

Signed-off-by: Alain Volmat <alain.volmat@foss.st.com>

Author: Alain Volmat

snippets/stm32/index.rst

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+.. _stm32-snippets:
+
+STM32 snippets
+##############
+
+.. toctree::
+   :maxdepth: 1
+   :glob:
+
+   **/*

snippets/stm32/video-stm32-venc/README.rst

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+.. _snippet-video-stm32-venc:
+
+STM32 Video ENCoder (VENC) Snippet (video-stm32-venc)
+#####################################################
+
+.. code-block:: console
+
+   west build -S video-stm32-venc [...]
+
+Overview
+********
+
+This snippet instantiate the STM32 Video ENCoder (VENC) and set it
+as ``zephyr,videoenc`` :ref:`devicetree` chosen node.
+
+Requirements
+************
+
+The board must have the hardware support for the Video ENCoder (VENC).

snippets/stm32/video-stm32-venc/snippet.yml

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+name: video-stm32-venc
+append:
+  EXTRA_DTC_OVERLAY_FILE: video-stm32-venc.overlay
+  EXTRA_CONF_FILE: video-stm32-venc.conf
+

snippets/stm32/video-stm32-venc/video-stm32-venc.conf

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+# VENC output format
+CONFIG_VIDEO_ENCODED_PIXEL_FORMAT="H264"
+
+# Default frame size
+CONFIG_VIDEO_FRAME_WIDTH=1920
+CONFIG_VIDEO_FRAME_HEIGHT=1080
+
+# VENC default input format
+CONFIG_VIDEO_PIXEL_FORMAT="NV12"

snippets/stm32/video-stm32-venc/video-stm32-venc.overlay

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+/*
+ * Copyright (c) 2025 STMicroelectronics
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/ {
+	chosen {
+		zephyr,videoenc = &venc;
+	};
+};
+
+&venc {
+	status = "okay";
+};