Hi there and welcome
Can you tell me please the make and model of your VHS player?
On the TV as seen on page 10 of the manual HERE
You see the Scart connection.
You connect the scart connection from the Panasonic to the TV's connection, then switch the source / input on the TV to scart and you will then see the image.
Let me know please how you go
what do you mean with the monitor being the supply of the video?
Can you clearly explain ALL elements involved?