Hi.
Can I run a program sorts of opening webcam, movie player or MSPowerpoint, not a website, via blueprint on UE4?
If it is available, I would try to integrate Processing program into UE4. I think it is possible UE4 Blueprint to control an ArduinoBoard is controlled by Processing Program on UE4. http://arduino.cc/en/Main/Products
You need UE to interface with the drivers for the specific hardware. Usually they’re generalized in such a way (like mice and keyboards) that one implementation will work for most cases. While this can be implemented in C++ in such a way that it is accessible with blueprints, I believe it goes beyond the scope of a purely blueprint based implementation.