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@yoav
Firstly, I may be wrong but that's not a track frame.
If its a steel frame then you can just pull the dropouts apart to fit the wheel in, though about 5mm either side is the most you'll manage easily. Steel frames can also be "cold set" to widen the dropout distance. This means bending the stays out wards in a jig to maintain alignment. Frame builders/repairers do this. You generally can't do it on an aluminium, titanium or carbon frame.
The hub in the upper photos looks like you can remove the spacer from the axle to get a narrower spacing. I've no idea what that is on the end of the axle in the lower photograph. Something from a mountain bike hub perhaps? Clearly that's too big and unlikely to be made to fit.
Both are road hubs with cassettes, so are you going single speed? Getting a new hub is possible but I suspect that the cost of the hub and rebuilding of the wheel is not going to be worth it compared to the cost of a new rear wheel, which should have threads for a single sprocket freewheel and/or fixed.