Is it possible to create a telescope in geostationary orbit, with real-time video from any country or area?
The big picture
The question lists several different applications. For deforestation (by logging, burning or anything else) or massive burning of fields before planting each year (also a huge problem in some parts of Asia) you don't need very high resolution.
In these cases you could monitor a very large area at modest resolution.
But these things take place with timescales of days or months, you would not need "video".
If "area" can be a few dozen city blocks (and not a whole country) and you want to monitor details in real time for security reasons (e.g. a car parked outside a building) then it is also possible, but...
But it would have to be quite a large telescope if you want the same resolution you can get from low Earth orbit (LEO).
Above are GIFs showing relatively high resolution videos from LEO. These are taken from this answer to Hovering Carbonite! Why do these satellite videos of Earth appear to be made from a geostationary location? and the question contains the original videos shot from orbit at about 500 km.
I can't find the exact diameter of the aperture, but Spaceflight 101 says:
The baseline envelope for the SSTL-X50 platform is 65 x 65 x 72 centimeters and satellites using the platform weigh around 100 Kilograms at launch.
So I'll estimate the aperture at 20 cm. That's consistent with answers to
Carbonite 1 Source
Now, suppose you wanted to do that (maintain the same resolution at Earth) but now at an altitude of 35,786 kilometers rather than 500 kilometers?
0.2 meters times 35,786 / 500 suggests an aperture of 14 meters!
That's twice the diameter of JWST!
For reasons of launch mass you would need to make your mirror segments out of exotic materials rather than glass like many space telescopes:
and considering the JWST cost roughly ten billion dollars this would probably set you back at least one billion.