Adding WebPart in Custom PageLayout

When we want to deploy an OOTB webpart in a custom page layout, handy solution would be to use  <AllUsersWebPart>.

Step 1:- Configure the settings of an OOTB webpart and export it.
Step 2:- Copy the contents of the webpart file.
Step 3:- Paste in Elements file of Module as given below inside <AllUsersWebpart> by specifying the webpart zone Id and Webpart order.

In below snippet i am adding OOTB Media WebPart to custom page layout

<?xml version="1.0" encoding="utf-8"?>

<Elements xmlns="http://schemas.microsoft.com/sharepoint/">

  <Module Name="PageLayouts" Url="_catalogs/masterpage" List="116">

    <File Path="PageLayouts\BlankWebPartPageCustom.aspx" Url="BlankWebPartPageCustom.aspx" Type="GhostableInLibrary" IgnoreIfAlreadyExists="TRUE" >         

        <AllUsersWebPart WebPartOrder="0" WebPartZoneID="Header">

          <![CDATA[

          <webParts>

  <webPart xmlns="http://schemas.microsoft.com/WebPart/v3">

    <metaData>

      <type name="Microsoft.SharePoint.Publishing.WebControls.MediaWebPart, Microsoft.SharePoint.Publishing, Version=15.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c" />

      <importErrorMessage>Cannot import this Web Part.</importErrorMessage>

    </metaData>

    <data>

      <properties>

        <property name="Hidden" type="bool">False</property>

        <property name="AutoPlay" type="bool">False</property>

        <property name="Height" type="unit">360px</property>

        <property name="TitleUrl" type="string" />

        <property name="Width" type="unit">640px</property>

        <property name="MediaSource" type="string" null="true" />

        <property name="Loop" type="bool">False</property>

        <property name="AllowConnect" type="bool">True</property>

        <property name="HelpUrl" type="string" />

        <property name="AllowZoneChange" type="bool">True</property>

        <property name="PreviewImageSource" type="string">/sites/TestCommunity/Style Library/Media Player/VideoPreview.png</property>

        <property name="TemplateSource" type="string" null="true" />

        <property name="DisplayMode" type="Microsoft.SharePoint.Publishing.WebControls.MediaDisplayMode, Microsoft.SharePoint.Publishing, Version=15.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c">Inline</property>

        <property name="ExportMode" type="exportmode">All</property>

        <property name="AllowHide" type="bool">True</property>

        <property name="AllowEdit" type="bool">True</property>

        <property name="Description" type="string">Use to embed media clips (video and audio) in a web page.</property>

        <property name="IsPreviewImageSourceOverridenForVideoSet" type="bool">False</property>

        <property name="AllowClose" type="bool">True</property>

        <property name="ChromeType" type="chrometype">None</property>

        <property name="ChromeState" type="chromestate">Normal</property>

        <property name="CatalogIconImageUrl" type="string" />

        <property name="HelpMode" type="helpmode">Navigate</property>

        <property name="TitleIconImageUrl" type="string" />

        <property name="ShowEmbedControl" type="bool">False</property>

        <property name="AllowMinimize" type="bool">True</property>

        <property name="Title" type="string">Media Web Part</property>

        <property name="VideoSetEmbedCode" type="string" null="true" />

        <property name="VideoSetSource" type="string" null="true" />

        <property name="ConfigureFromContext" type="bool">False</property>

        <property name="Direction" type="direction">NotSet</property>

      </properties>

    </data>

  </webPart>

</webParts>

        ]]>

        </AllUsersWebPart>

    </File>

  </Module>

</Elements>

If multiple webparts has to be deployed just add more <File> tags with <AllUserWebPart> as child.