app/assets/javascripts/video-sound-toggle.coffee
$(document).on
mouseenter: -> toggle_video_mute(@)
mouseleave: -> toggle_video_mute(@)
, '.meta.photos.processed .item.video, .meta.marker-detail .item.video'
toggle_video_mute = (video_container) ->
$video = $(video_container).find('video')
$video.prop('muted', !$video.prop('muted'))