Proximity Sensor To Start Recording

Hi

Relative noob for Physical Security systems but not IT. We need to perform the following: Start recording when a person is 6 to 8 feet away from a specific object/spot. When the person o/object is removed from the area then recording would stop. We are Ok on the VMS side for the alarm. We are having some problems finding what sensor to use. A mat would have been used but not practical in that environment. What would you suggest for a sensor with a relay that would allow us to reliably detect the presence of a person or object within an angle of 60 degrees and a radius of 5 feet or less? We would like it to be low cost (<$30) and be able to be powered by 12 VDC with a relay output.

Your suggestions are welcomed

Thanks In Advance

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