They also made a video of the current condition of the unit when they entered it. 

This goes back a ways - video

I made a video introducing my house for a prospective resident who lives overseas (http://www.aiyouliliang.com/129w/index.htm). , introducing the area around the house, the layout of the house, and a few common house chores that they are expected to complete and how to do them (i.e. garbage, snow removal, grass cutting, keeping basement humidity correct...)1) In the future, is it a good idea to post a video for prospective tenants and ask them to watch it first before showing?

Just like you explain in your videos! 

Some foreclosure websites also have how to videos.

Call me Friday to schedule a time we can talk. ( always get their number) but thus far 93% of the time they call me.Mike, and others another great idea we use is every single week do a video of the progression of the house to show your investor what has been accomplished.

I've seen some good videos on this topic. 

Video walk through of **** roach flip

You can listen to wholesaling on video on biggerpcokets.

As a RE seller and I sell a lot of property each year that we own well over 70 properties and almost all the pre approval letters come in right at the max they can borrow IE they get approved for 400k they don't shop for a 250k house they go right to the max.For the Rich and famous I have bought those as well  ( well at least sports stars) and I will mention one by name since he is deceased..