I am thinking of the possibility of using Krakend SDR if I want to detect the direction of the drone through the frequency that helps the drone transmit the signal to the ground station as a video stream.
That will be hard, here in EU, and most of the world its 5,8 GHz and 2,4 GHz. And kraken can not work in these frequency bands, better put a small licence free beacon device on the drone and use that to track with kraken.
If the signal operates within the 1766 MHz max tuning range of the Kraken it could work.