JQuery DataTables - Custom Header

I researched a lot and could not figure out how to customize the pdf report header that I generated from the plugin; For example, the "sTitle": "Groups" is the title that is in the header, but it comes out with the default styling of the plugin, and also do not know how to add a subtitle with its own style, center, add a date, etc.

The following table call follows:

$("#dinamicTable").dataTable({
    "sDom": 'T<"clear">lfrtip',
    "oTableTools": {
        "sSwfPath": "webroot/libs/datatables/js/media/swf/copy_csv_xls_pdf.swf",
        "aButtons": [ 
            {
                "sExtends": "pdf",
                "sTitle": "Grupos"
            },
            {
                "sExtends": "xls",
                "sTitle": "Grupos"
            }
        ]
    }
});

And the Table:

<table id="dinamicTable" class="table table-bordered table-striped table-condensed">
    <thead>
        <tr>
            <th width="10%">ID</th>
            <th>GRUPO</th>
            <th width="10%">STATUS</th>
            <th width="10%">OPÇÕES</th>
        </tr>
    </thead>
    <tbody>
        <?php foreach ($view_grupos as $grupo) : ?>
            <tr>
                <td><?php echo $grupo['grup_id']; ?></td>
                <td><?php echo $grupo['grup_nome']; ?></td>
                <td align="center"><?php echo $grupo['grup_status']; ?></td>

            </tr>
        <?php endforeach; ?>
    </tbody>
    <tfoot>
        <tr>
            <th>ID</th>
            <th>GRUPO</th>
            <th>STATUS</th>
            <th>OPÇÕES</th>
        </tr>
    </tfoot>
</table>