ol.proj.transform Zoomify to EPSG:4326 - openlayers-3

Question

Is there any way to transform from Zoomify (with a specific width and height) to [long, lat] coordinates ?
I saw the documentation (for 3.6) and it seems that ol.proj.transform method does not accept ZOOMIFY as ol.proj.ProjectionLike parameter.
Currently, I have some marker coordinates saved by LeafletJS library into database and I need to project them into [long, lat] coordinates to display them with a OpenLayer 3.6 map. The tiles for the map are the same as it was for Leaflet library.
If needed, here is the code for initiating the ol3 map:
var proj = new ol.proj.Projection({
code: 'ZOOMIFY',
units: 'pixels',
extent: [0, 0, width, height]
}),
map = new ol.Map({
target: this.get('view').$().attr('id'),
view: new ol.View({
projection: proj,
center: [width/2, - height/2],
zoom: 1,
extent: [0, -height, width, 0]
}),
controls: []
});
......
var layer = new ol.source.Zoomify({
url: url,
size: [width, height],
crossOrigin: 'anonymous'
});
map.addLayer(layer);
Also, the code that I'm using to add the markers is:
pos = ol.proj.transform([posX, posY], 'ZOOMIFY', 'EPSG:4326'),
marker = new ol.Overlay({
position: pos,
positioning: 'center-center',
element: domElement,
stopEvent: false
});
map.addOverlay(marker);
I need to mention that I am really new with this framework, so any hint can be helpful.
Thanks,

Answer 1

It seems that you did not need to transform the coordinates since the frameworks know that the coordinates are in the ZOOMIFY format (from the map creation, see above lines).
I solved the problem with the following code:
pos = [posX, posY],
marker = new ol.Overlay({
position: pos,
positioning: 'center-center',
element: domElement,
stopEvent: false
});
map.addOverlay(marker);