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))))))))))) (. .)))
The item later turned out to be a pager that was clipped to his pocket.
( ( The item ) ( later ( ( ( turned out ) ( to ( be ( ( a pager ) ( that ( was ( clipped ( to ( his pocket ) ) ) ) ) ) ) ) ) . ) ) )
(ROOT (S (NP (DT The) (NN item)) (ADVP (RB later)) (VP (VBD turned) (PRT (RP out)) (S (VP (TO to) (VP (VB be) (NP (NP (DT a) (NN pager)) (SBAR (WHNP (WDT that)) (S (VP (VBD was) (VP (VBN clipped) (PP (TO to) (NP (PRP$ his) (NN pocket)))))))))))) (. .)))