It's quick 15 minute exercise routine using light weights (I use full, small plastic water bottles for weights) that you can squeeze into your day at any time. Of course, you should approach these types of exercise movements at the level your body is capable of completing.
Do NOT get carried away and try to compete with the instructor, until you have built-up your cardio capabilities and your muscles. You are competing against yourself at first, no one else.
Eventually you want to be 'feeling the burn' - which should be a tingle, rather than painful strains.
The MAIN thing about doing this routine, or any exercise workout, is that it should be fun! Something to look forward to, not be dreading. I personally suggest doing this routine (at your level) 3 - 4 times a week.
Although if you could get into the 'habit' of fitting it in (or something like it) every day, your weight loss will be more dramatic, and the improvements in your health and well-being will increase corresponsingly quicker. Of course, you have to be careful that you do not over-do it on any particular day, and then need several days off to recover.
Remember it is your body, and it is up to you the level you work at - NO one else...
Once you get used to the idea of the workout and learn all the movements - I strongly suggest that you dispense with the video and make-up your own routines, by 'listening' to your OWN body and paying more attention to the moves YOU feel are being more beneficial to you.
It really is no good, doing what most people do... that is start off with vigor and commitment (perhaps, even being over-zealous) with exercise / workout routines and then get burned-out, or bored after a few weeks. The exercise then becomes a chore, rather than an everyday recreational activity.
Maybe use the moves you have learned in your own dance routines, or even combine them within your household chores. Whatever it is you do - make it fun.
Youtube is awash with similar exercise routines to this one and you can find all the (free) exercise routines you will ever need...