Hi, I am also new to Hikvision and CCTV but if you enable the rules option via the web interface:
Configuration -> Local -> Live View Parameters -> Rules (Set to Enable)
then it will at least show you on the live view and playback view where it is detecting the motion that is triggering the...
When using the web interface and playing back the recording in the full window, towards the bottom left of the screen there is a dotted icon with a waste bin in the bottom right hand corner which then allows selection of the solid square icon with 4 circular arrows. This adds the motion markers...