Found on stackover, WordPress image upload anywhere

gistfile1.txt

<?php wp_enqueue_media(); ?>
<div>
    <label for="image_url">Image</label>
    <input type="text" name="image_url" id="image_url" class="regular-text">
    <input type="button" name="upload-btn" id="upload-btn" class="button-secondary" value="Upload Image">

</div>
		<script type="text/javascript">
			jQuery(document).ready(function($){
			    $('#upload-btn').click(function(e) {
			        e.preventDefault();
			        var image = wp.media({ 
			            title: 'Upload Image',
			            // mutiple: true if you want to upload multiple files at once
			            multiple: false
			        }).open()
			        .on('select', function(e){
			            // This will return the selected image from the Media Uploader, the result is an object
			            var uploaded_image = image.state().get('selection').first();
			            // We convert uploaded_image to a JSON object to make accessing it easier
			            // Output to the console uploaded_image
			            console.log(uploaded_image);
			            var image_url = uploaded_image.toJSON().url;
			            // Let's assign the url value to the input field
			            $('#image_url').val(image_url);
			        });
			    });
			});
		</script>