Save that file because you need it when next update* modules\boonex\messenger\template\text_area.html 

Delete 

<li class="video">    <a title="<bx_text:_bx_messenger_send_recorded_video />" onclick="oMessenger.showPopForm('get_record_video_form');">        <i class="sys-icon file-video"></i>    </a> </li>