The clip below is provided by Glazier Clinics. In the video Troy Abbs, Head Coach at Trine University discusses a tackling and turnover circuit they use in practice.
You can get more video like this at glazierclinics.com. You also might want to check out their YouTube Channel.
The YouTube video has sound, so please sure that your sound is turned on and that you have access to the site (Some schools block access to YouTube)