The engage stage is the hardest to correlate to cold, hard sales. Because users aren’t necessarily looking to purchase here, they can watch your video, learn some information, and not come back to your website for a long time. Try to implement detailed tracking information to show you big-picture user behavior; drop cookies and retrieve path information for every person who views your video or goes to your site. Then, you can see what percentage of visitors end up buying from you.
Tripods range tremendously in price, and the quality of your tripod should depend on the level of camera and lens you have. If you're shooting with your phone, you can get by with a table mount like the Arkon Tripod Mount or a full-size tripod like the Acuvar 50” Aluminum Tripod. For a DSLR, Manfrotto makes a variety of trustworthy tripods starting with the Manfrotto BeFree and increasing in quality and price from there.