Your video link:
As @
cannonride15 mentioned, the Shimano hubs are rebuildable, and replacement cones and bearings are readily available.
If you ride on it with the axle loose, you risk more damage.
Any bike shop should be able to clean up your wheel, and get it going. Or, there should be instructions online. You'll need a 15mm cone wrench, and a 17mm wrench. I find it is easiest to remove the cassette when working on the hubs, and do the final adjustments from the "non drive side".
You'll probably also need a pile of 1/4" bearings.