Rocket.Chat/packages/rocketchat-ui/views/app/videoCall/videoButtons.html

<template name="videoButtons">
	<div class="group-call-buttons">
		{{#if videoAvaliable}}
			{{#unless videoActive}}
				{{#if callInProgress}}
					<button class="join-video-call button secondary" aria-label="{{_ "Join_video_call"}}"><i class="icon-videocam"></i></button>
					<button class="join-audio-call button secondary" aria-label="{{_ "Join_audio_call"}}"><i class="icon-phone"></i></button>
				{{else}}
					<button class="start-video-call button" aria-label="{{_ "Start_video_call"}}"><i class="icon-videocam"></i></button>
					<button class="start-audio-call button" aria-label="{{_ "Start_audio_call"}}"><i class="icon-phone"></i></button>
				{{/if}}
			{{/unless}}
		{{/if}}
	</div>
</template>