You are better off looking into materials by my friend shifu Neil Ripski. He is a disciple of George Xu and direct grand-student of Yu Hualong. Why Neil? Because he's approachable, eager to teach and share, and can explain this system brilliantly in plain English. Further, being that he is also a practitioner of Cheng and Yin style Bagua, as well as Chen Taiji and formerly also practiced Hebei Xing Yi, he can draw a lot of useful comparisons between all of these arts and Yu Hualong's lineage. Great dude, I love him. Not sure whether he has actual DVDs on the system, but sure got lots of video content on his youtube channel relevant to what you're looking for:
https://www.youtube.com/playlist?list=PLlhxK3y_nUa1K7vEaqNUOKbWjcULvR5yBOh and if Neil put these 38 minutes of Yu shifu on his own channel (see above), I guess that's public domain these days or that simply no one cares anymore...
http://redjade.weebly.com/xinyiliuhe.htmlDo consider that Yu is dead and George Xu is no longer teaching openly.