How to write a MATLAB script to execute some tasks, and play a video with specific timing?

How to write a MATLAB script to execute some tasks, and play a video with
specific timing?

I am doing some research in Biomedical Engineering, a prosthetic hand more
specifically. We have a DAC interfacing with MATLAB. Summerizing, this DAC
is responsible for delivering some neuronal signals into a human subject.
These signals are related to some haptic sensing in the human subject.
I need to synchronize this signal with a video, which will be displayed
for the subject. The video will display a simulation of the event that
would be generating the signal of the sensory input, so that the subject
will be trained to assimilate the signal to the event.
So, i need to play the video and run the code for driving the DAC in a
synchronized way (no more than 1msec of delay). I don`t have a lot of
experience with MATLAB. I have researched a bit, and found a little about
the funcion implay, but that is still a little confusing. Would appreciate
very much some help with this.