add_subwindow(title = new BC_Title(x2, y, _("Tracking file:")));
add_subwindow(tracking_file = new MotionCVTrackingFile(plugin,
plugin->config. tracking_file, this,
x2 + title->get_w() + 20, y));
add_subwindow(title = new BC_Title(x2, y, _("Tracking file:")));
add_subwindow(tracking_file = new MotionCVTrackingFile(plugin,
plugin->config. tracking_file, this,
x2 + title->get_w() + 20, y));