una/modules/boonex/timeline/template/attach_video_preview.html

<div class="__style_prefix__-item-video">
    <bx_if:show_link>
        <a href="__url__"><img class="__style_prefix__-iv-image" src="__src__" /></a>
    </bx_if:show_link>
    <bx_if:show_non_link>
        <img class="__style_prefix__-iv-image" src="__src__" />
    </bx_if:show_non_link>
    <bx_if:show_duration>
        <div class="__style_prefix__-iv-duration bx-def-padding-thd bx-def-border bx-def-round-corners">__duration__</div>
    </bx_if:show_duration>
</div>