How to use the wagtailmedia.permissions.permission_policy.user_has_permission_for_instance function in wagtailmedia

def delete(request, media_id):
    Media = get_media_model()
    media = get_object_or_404(Media, id=media_id)

    if not permission_policy.user_has_permission_for_instance(request.user, 'delete', media):
        return permission_denied(request)

    if request.POST:
        media.delete()
        messages.success(request, _("Media file '{0}' deleted.").format(media.title))
        return redirect('wagtailmedia:index')

    return render(request, "wagtailmedia/media/confirm_delete.html", {
        'media': media,
    })

except OSError:
            # File doesn't exist
            pass

    if not filesize:
        messages.error(
            request,
            _("The file could not be found. Please change the source or delete the media file"),
            buttons=[messages.button(reverse('wagtailmedia:delete', args=(media.id,)), _('Delete'))]
        )

    return render(request, "wagtailmedia/media/edit.html", {
        'media': media,
        'filesize': filesize,
        'form': form,
        'user_can_delete': permission_policy.user_has_permission_for_instance(
            request.user, 'delete', media
        ),