Welcome to Cathe. There really are no videos that are specific to weight loss. All forms of exercise are going to help you lose weight. What you can do to "increase" that effect is use combinations of tapes in forms of rotations. Of course that means major investment in videos (and all of here will tell you OH DARN more tapes ) Anyway for different weight loss rotations check out...
Deborah is right, you can't go wrong with Cathe, whatever workouts you choose will help you lose weight, but also remember part of any weight loss plan is eating the right foods, so with eating well and Cathe, you're on your way!