Banana Pi advice

HI, I’m new to the forum and hope you can help me. I plan to buy a Banana PI Pro to run on Android. To the banana I wanted to connect then over the Otg connection my Dslr around an Android App me the live picture to show. The banana should be connected to a screen and serve as a mobile director. I hope you can help me? Please help. Thanks! I didn’t find the right solution from the Internet. References:

Animated Business Whiteboard Video