Well the same rules of limiting impacts apply that have previously been stated to try to ensure the longevity of your tree. However the laying of brick or concrete pavers over any living root system I'm afraid is asking for trouble down the line. Your pavers will end up being lifted by the tree roots unless you remove absolutely all of them under the proposed paving and install a good quality root barrier along the edge of your pavers to prevent root growth under them. In doing that you are going to remove more root mass, installing pavers this close to even an early mature tree is asking for trouble really.
On the other hand if you are looking at the pavers as a somewhat temporary structure then I suppose the fact that the tree will lift them creating trip hazards is not such a bad thing.....but if the pavers are to be a bigger longer term project, major landscaping then I would advise considering changing o a suspended timber deck much less impact on the roots and soil (when carefully designed)
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We fell them down and turn them into paper,
That we may record our emptiness.
- Kahlil Gibran
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