Yes and no. Typical multi-camera video systems can generate data at a prodigious rate. You can "either" put together a RAID system to handle the write bandwidth your you can use a couple of SSDs. The latter is "simpler" the former is more "economical".
That said, when NetApp was trying to sell SATA based filers into this market (which, not surprisingly is VERY cost sensitive) two things became apparent. First, up front system cost had to be minimized, and the vendors of these systems saw disk failure as a revenue opportunity to "roll a truck" to the customer and replace a failed drive.
