ioctl VIDIOC_OVERLAY
********************
-NAME
+Name
====
VIDIOC_OVERLAY - Start or stop video overlay
-SYNOPSIS
+
+Synopsis
========
.. cpp:function:: int ioctl( int fd, int request, const int *argp )
-ARGUMENTS
+Arguments
=========
``fd``
``argp``
-DESCRIPTION
+Description
===========
This ioctl is part of the :ref:`video overlay <overlay>` I/O method.
``V4L2_BUF_TYPE_VIDEO_OVERLAY``.
-RETURN VALUE
+Return Value
============
On success 0 is returned, on error -1 and the ``errno`` variable is set