Bootstrap 4

HTML

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css">
<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"></script>
<div class="container-fluid">
    <div class="row">
        <div class="col-12">
            <button type="button" class="btn btn-primary open-modal" data-toggle="modal" data-target="#bs-modal">
            Open Modal
            </button>
            <div class="modal fade" id="bs-modal" tabindex="-1" role="dialog" aria-hidden="true">
                <div class="modal-dialog modal-lg" role="document">
                    <div class="modal-content">
                        <div class="modal-header">
                            <h5 class="modal-title" id="exampleModalLabel">Bootstrap 4 Modal</h5>
                            <button type="button" class="close" data-dismiss="modal" aria-label="Close">
                            <span aria-hidden="true">&times;</span>
                            </button>
                        </div>
                        <div class="modal-body">
                            <button type="button" class="btn btn-secondary btn-sm bs-popover" data-container="body" data-toggle="popover">
                            Show Popover
                            </button>
                            <div id="popover-content">
                                <div class="form-check">
                                    <input class="form-check-input" type="checkbox" value="1"
                                        id="default-checkbox" name="default-checkbox">
                                    <label class="form-check-label" for="default-checkbox">
                                    Default Checkbox
                                    </label>
                               ...

CSS

.open-modal {
  margin: 20px;
}
.modal-body {
  min-height: 200px;
}
#popover-content {
  display: none;
}

JavaScript

$('.bs-popover').popover({
	html: true,
  content: function() {
  	return $('#popover-content').html();
  },
  title: 'Popover Title'
})