ohif-viewer/Packages/viewerbase/client/components/viewer/playClipButton/playClipButton.html

<template name="playClipButton">
    <button id="playClip" type="button" class="imageViewerCommand btn btn-sm btn-default"
            data-container="body" data-toggle="tooltip" data-placement="bottom" title="Play/Stop Clip">
        {{ #if isPlaying }}
            <span class="fa fa-stop"></span>
        {{ else }}
            <span class="fa fa-play"></span>
        {{ /if }}
    </button>
    <button id="toggleCineDialog"  type="button" class="imageViewerCommand btn btn-sm btn-default"
            data-container="body" data-toggle="tooltip" data-placement="bottom" title="Toggle CINE Dialog">
        <span class="fa fa-youtube-play"></span>
    </button>
</template>