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The majority of the work required is embedded software and webserver development, per below:
1- Microcontroller code for determining presence/approach the client to the sensor which is connected to Linux system
2- Software running on embedded Linux system (Collector) to read sensor information from Microcontroller, act as local server to Video Units, store usage information and provide link to cloud server.
Software running on embedded Linux system connected to monitors (Video Units), that communicates with cloud server and the Collector to control video playback and choice of video.
Cloud server to manage with system remotely, change configuration and video settings.
More detail can be provided is its necessary.