The video footage indicates that he was carrying an unidentified item in his back pocket, clipped to its rim.
( ( The ( video footage ) ) ( ( indicates ( that ( he ( was ( ( carrying ( an ( unidentified item ) ) ) ( in ( ( ( his ( back pocket ) ) , ) ( clipped ( to ( its rim ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (JJ video) (NN footage)) (VP (VBZ indicates) (SBAR (IN that) (S (NP (PRP he)) (VP (VBD was) (VP (VBG carrying) (NP (DT an) (JJ unidentified) (NN item)) (PP (IN in) (NP (NP (PRP$ his) (JJ back) (NN pocket)) (, ,) (VP (VBN clipped) (PP (TO to) (NP (PRP$ its) (NN rim))))))))))) (. .)))
As there was no video footage, witnesses said his back pockets were empty.
( ( As ( there ( was ( no ( video footage ) ) ) ) ) ( , ( witnesses ( ( said ( ( his ( back pockets ) ) ( were empty ) ) ) . ) ) ) )
(ROOT (S (SBAR (IN As) (S (NP (EX there)) (VP (VBD was) (NP (DT no) (JJ video) (NN footage))))) (, ,) (NP (NNS witnesses)) (VP (VBD said) (SBAR (S (NP (PRP$ his) (JJ back) (NNS pockets)) (VP (VBD were) (ADJP (JJ empty)))))) (. .)))