directive('VideoDtv', function VideoDtv() {

    var VideoDtv = {
        scope: {
            muted: '='
        },
        controller: function($scope) {
            // controller stuff
        },
        link: function($scope, htmlElement) {
            $scope.$watch('muted', function(currentMutedValue, previousMutedValue) {

                if (currentMutedValue === true) {
                    videoElement.mute();
                } else {
                    videoElement.unmute();
                }

            });
        }
    };

});


<video video-dtv data-muted="booleanScopeVariable" />
<video data-video-dtv muted="true" />