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not much can be done as the chuck is not specifically designed to handle hammer drill operations (they crack the scroll thread adjuster inside )
best get a new chuck and if you do a lot of hammering get a proper hammer drill that has a push in operation not an ordinary electrical drill with a hammer capability
Can not see what model you have. Is it a keyless chuck or an SDS chuck? With a keyless chuck hold the machine in a vice by the drill bit. now tap the chuck with a hammer or pin punch & hammer. DONOT hit the chuck on the jaws gut on the rim around them. I have had success using this method. If it is an SDS type chuck pull the chuck cap up as far as possible along the bit them if there are any ring springs you will have to try remove them then slide the sleeve up the bit, now you should be able to remove any steel balls. If the bit does not come out now hold bit in vice as before and tap on tool holder.
while holding the drill like a gun, hold the lock button REALLY tight and pull the black part to the right really hard. this will unlock the chuck and if you keep twisting the black part to the right it will loosen it enough so that you can remove it
These units have only been out for a short while and most are on warranty. Take it to a Bosch Service center in your area and they will replace the front of the unit. Unfortunatly this is a problem with this type of unit. The bit will deform slightly from the impacting action and lock itself in the chuck.