Since I don't know what you know... I'll do the safe assumption and assume that is nothing, always the best practice when giving out information or recommendations. I don't have direct use recommendations for surveillance quality drives and they make new models all of the time, so if I had, it'd likely be dated by now. Instead I'll just stick with the easy part... the info you need to know in order to pick from a sea of hard drives.
The way I think of HDD's or any part for that matter... is by the type of use they going to be used for and the reliability they will have. For the reliability arena, I generically refer to them as good for home or small business ( this is what most of us will have in our systems )... and good for enterprise use which has a much higher reliability rating and a larger MTBF rating ( mean time between failure, the bigger the better of course ) than the previous.
Surveillance drives fall into the enterprise level of drives and as such cost more. The surveillance drives ( DVR and NVR are these also, just different naming is all ) you not only want a high MTBF rating but they are going to be writing something close to 95% of the time 24/7. So write speeds are more important than their read speeds and as such, make them more expensive than many of the other types of enterprise level drives. The other types of enterprise level drives are either made for faster read speeds vs the write speeds or they are made for archive storage where capacity is the primary goal and write speeds are less of a factor.
So you will want a surveillance qualified drive that has the capacity that you are looking for. If you try to use a drive made for one of the other tasks instead, it will either not have the performance you are looking for or the longevity just depending on which type you pick up.
The following may be dated but was correct the last time I looked for a surveillance drive. Western Digital's surveillance drives are known as their Purple drives. Seagate's are known as their SkyHawk line. Toshiba's drives are named as their S 300 line. I'm uncertain if HGST has a name for theirs or not but they are a good brand, just make sure it mentions being made for surveillance.
I believe once you have a make/model in mind... a google search should come up with some decent info about how good that specific make/model is...