I think its a good idea.
Of course its not ideal, but a hectic schedule is uncompromising. Everything needs a 'catalyst'. If you try and steal an hour a day to drill things you already know you will find it hard to find the incentive, especially when you are training alone. Trying to learn something new is good, it gets your mind working on it and provides a great distraction from the other things. It doesn't matter what level you can get to doing this, if it ensures you do something every day then its great, it gets you back in the KungFu mindset. And if you do come across a HungGar master you can correct your form.
That being said I don't know what these videos are like. I think they are old no? They might be very low resolution compared to todays standard. However HungGar is a popular style and there are so many videos on YouTube I suppose if there is a bit in the video that is not clear you can look at many performances online and compare. I would pick up a theory book at the same time though, it can fill in some of the blanks.
問「武」。曰:「克。」未達。曰:「勝己之私之謂克。」