Camera as sensor (slow movements)

From mindaugas on 2014/12/27 18:24:42 +0000

I saw this ted talk recentry :

their page:

would it be much (very much) truble to implement this technology?
of course there are problems like the phone is lying on the mattress, but I actually have a few webcams that are lying around I could record the video on the necessary angle (connect to phone via otg, wifi or what ever).
also the darkness of the night… well I you can use IR lamps to light the room for the cameras (basically human cant see but camera can)
I just wonder how what accurate are the measurements of lets say of a pulse (i think this is quite an important measurement for sleep and other activities) compared to a device that is on your wrist like wearable

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