I have seen +ve 24 v taken from seperate power supply source given to +ve terminal of 2 wire transmitter
And -ve terminal of 2 wire transmitter connected back to + ve terminal of analog input card.
For the same analog i/p card -ve terminal will be get given direct from power supply source.
But in your youtube video it was different way.

Thanks

There are two types of 4-20ma analog input cards. The video showed connecting an analog input where the analog card provides "loop power". In this case, +24VDC power is provided by the PLC backplane. Other types of analog input cards require an external 24VDC power supply, which would be wired as you described. That is why we always caution: before wiring any device, consult the wiring diagrams provided by the manufacturer of your I/O cards for determining proper connections.