Icon Symbolizer

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var iconFeature = new ol.Feature({
  geometry: new ol.geom.Point([0, 0]),
  name: 'Null Island',
  population: 4000,
  rainfall: 500
});

var iconStyle = new ol.style.Style({
  image: new ol.style.Icon(/** @type {olx.style.IconOptions} */ ({
    anchor: [0.5, 46],
    anchorXUnits: 'fraction',
    anchorYUnits: 'pixels',
    src: 'https://openlayers.org/en/v4.6.4/examples/data/icon.png'
  }))
});

iconFeature.setStyle(iconStyle);

var vectorSource = new ol.source.Vector({
  features: [iconFeature]
});

var vectorLayer = new ol.layer.Vector({
  source: vectorSource
});

var rasterLayer = new ol.layer.Tile({
  source: new ol.source.TileJSON({
    url: 'https://api.tiles.mapbox.com/v3/mapbox.geography-class.json?secure',
    crossOrigin: ''
  })
});

var map = new ol.Map({
  layers: [rasterLayer, vectorLayer],
  target: document.getElementById('map'),
  view: new ol.View({
    center: [0, 0],
    zoom: 3
  })
});

var element = document.getElementById('popup');

var popup = new ol.Overlay({
  element: element,
  positioning: 'bottom-center',
  stopEvent: false,
  offset: [0, -50]
});
map.addOverlay(popup);

// display popup on click
map.on('click', function(evt) {
  var feature = map.forEachFeatureAtPixel(evt.pixel,
      function(feature) {
        return feature;
      });
  if (feature) {
    var coordinates = feature.getGeometry().getCoordinates();
    popup.setPosition(coordinates);
    $(element).popover({
      'placement': 'top',
      'html': true,
      'content': feature.get('name')
    });
    $(element).popover('show');
  } else {
    $(element).popover('destroy');
  }
});

// change mouse cursor when over marker
map.on('pointermove', function(e) {
  if (e.dragging) {
    $(element).popover('destroy');
    return;
  }
  var pixel = map.getEventPixel(e.originalEvent);
  var hit = map.hasFeatureAtPixel(pixel);
  map.getTarget().style.cursor = hit ? 'pointer' : '';
});

<!DOCTYPE html>
<html>
  <head>
    <title>Icon Symbolizer</title>
    <link rel="stylesheet" href="https://openlayers.org/en/v4.6.4/css/ol.css" type="text/css">
    <!-- The line below is only needed for old environments like Internet Explorer and Android 4.x -->
    <script src=""></script>
    <script src="https://openlayers.org/en/v4.6.4/build/ol.js"></script>
    <script src="https://code.jquery.com/jquery-2.2.3.min.js"></script>
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css">
    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>
    <style>
      #map {
        position: relative;
      }
    </style>
  </head>
  <body>
    <div id="map" class="map"><div id="popup"></div></div>
    <script>
      var iconFeature = new ol.Feature({
        geometry: new ol.geom.Point([0, 0]),
        name: 'Null Island',
        population: 4000,
        rainfall: 500
      });

      var iconStyle = new ol.style.Style({
        image: new ol.style.Icon(/** @type {olx.style.IconOptions} */ ({
          anchor: [0.5, 46],
          anchorXUnits: 'fraction',
          anchorYUnits: 'pixels',
          src: 'https://openlayers.org/en/v4.6.4/examples/data/icon.png'
        }))
      });

      iconFeature.setStyle(iconStyle);

      var vectorSource = new ol.source.Vector({
        features: [iconFeature]
      });

      var vectorLayer = new ol.layer.Vector({
        source: vectorSource
      });

      var rasterLayer = new ol.layer.Tile({
        source: new ol.source.TileJSON({
          url: 'https://api.tiles.mapbox.com/v3/mapbox.geography-class.json?secure',
          crossOrigin: ''
        })
      });

      var map = new ol.Map({
        layers: [rasterLayer, vectorLayer],
        target: document.getElementById('map'),
        view: new ol.View({
          center: [0, 0],
          zoom: 3
        })
      });

      var element = document.getElementById('popup');

      var popup = new ol.Overlay({
        element: element,
        positioning: 'bottom-center',
        stopEvent: false,
        offset: [0, -50]
      });
      map.addOverlay(popup);

      // display popup on click
      map.on('click', function(evt) {
        var feature = map.forEachFeatureAtPixel(evt.pixel,
            function(feature) {
              return feature;
            });
        if (feature) {
          var coordinates = feature.getGeometry().getCoordinates();
          popup.setPosition(coordinates);
          $(element).popover({
            'placement': 'top',
            'html': true,
            'content': feature.get('name')
          });
          $(element).popover('show');
        } else {
          $(element).popover('destroy');
        }
      });

      // change mouse cursor when over marker
      map.on('pointermove', function(e) {
        if (e.dragging) {
          $(element).popover('destroy');
          return;
        }
        var pixel = map.getEventPixel(e.originalEvent);
        var hit = map.hasFeatureAtPixel(pixel);
        map.getTarget().style.cursor = hit ? 'pointer' : '';
      });
    </script>
  </body>
</html>