Command-that-works

curl -XPOST http://zmdevapi/monitors.js -d "Monitor[Name]=Cliff-Burton \&Monitor[Function]=Modect \ &Monitor[Protocol]=http \ &Monitor[Method]=simple \&Monitor[Host]=ussr:pass@192.168.11.20 \ &Monitor[Port]=80 \ &Monitor[Path]=/mjpg/video.mjpg\ &Monitor[Width]=704 \ &Monitor[Height]=480 \ &Monitor[Colours]=4”

controller.js

ZoneMinder.controller('MonitorController', function($scope, $http) {
        $scope.monitor = {};

        $scope.submitMonitor = function() {
        $http({
        method  : 'POST',
        url     : '/api/monitors.json',
        data    : $scope.monitor,  
        headers : { 'Content-Type': 'application/x-www-form-urlencoded' }  // set the headers so angular passing info as form data (not request payload)
    })
        .success(function(data) {
            console.log(data);

            if (!data.success) {
                // if not successful, bind errors to error variables
                $scope.errorName = data.errors.name;
                $scope.errorSuperhero = data.errors.superheroAlias;
            } else {
                // if successful, bind success message to message
                $scope.message = data.message;
            }
        });
        };
});

Params passed via Firefox inspect

{"sourceType":"Remote","RefBlendPerc":6,"AlarmRefBlendPerc":6,"Function":"Monitor","Name":"Cliff-Burton","Colours":"4","Width":1920,"Height":1080,"Protocol":"http","Method":"simple","Host":"1.2.3.4","Port":80,"Path":"/some/path.jpg"}:""